Add NewLazyLexer to defer rules definitions and reduce init costs (#449)

Add NewLazyLexer and MustNewLazyLexer which accept a function that returns the rules for the lexer. This allows us to defer the rules definitions until they're needed. Lexers in a, g, s, and x packages have been updated to use the new lazy lexer.
2025-03-17 20:58:08 +02:00 · 2021-02-07 19:16:49 -06:00 · 2021-02-07 19:16:49 -06:00 · 59126c5b32
commit 59126c5b32
parent 5da831672d
188 changed files with 1935 additions and 1133 deletions
--- a/lexers/a/abap.go
+++ b/lexers/a/abap.go
@ -6,7 +6,7 @@ import (
 )

 // ABAP lexer.
-var Abap = internal.Register(MustNewLexer(
+var Abap = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "ABAP",
 		Aliases:         []string{"abap"},
@ -14,7 +14,11 @@ var Abap = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-abap"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	abapRules,
+))
+
+func abapRules() Rules {
+	return Rules{
 		"common": {
 			{`\s+`, Text, nil},
 			{`^\*.*$`, CommentSingle, nil},
@ -52,5 +56,5 @@ var Abap = internal.Register(MustNewLexer(
 			{`[/;:()\[\],.]`, Punctuation, nil},
 			{`(!)(\w+)`, ByGroups(Operator, Name), nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/abnf.go
+++ b/lexers/a/abnf.go
@ -6,14 +6,18 @@ import (
 )

 // Abnf lexer.
-var Abnf = internal.Register(MustNewLexer(
+var Abnf = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "ABNF",
 		Aliases:   []string{"abnf"},
 		Filenames: []string{"*.abnf"},
 		MimeTypes: []string{"text/x-abnf"},
 	},
-	Rules{
+	abnfRules,
+))
+
+func abnfRules() Rules {
+	return Rules{
 		"root": {
 			{`;.*$`, CommentSingle, nil},
 			{`(%[si])?"[^"]*"`, Literal, nil},
@ -34,5 +38,5 @@ var Abnf = internal.Register(MustNewLexer(
 			{`\s+`, Text, nil},
 			{`.`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/actionscript.go
+++ b/lexers/a/actionscript.go
@ -6,7 +6,7 @@ import (
 )

 // Actionscript lexer.
-var Actionscript = internal.Register(MustNewLexer(
+var Actionscript = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:         "ActionScript",
 		Aliases:      []string{"as", "actionscript"},
@ -15,7 +15,11 @@ var Actionscript = internal.Register(MustNewLexer(
 		NotMultiline: true,
 		DotAll:       true,
 	},
-	Rules{
+	actionscriptRules,
+))
+
+func actionscriptRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`//.*?\n`, CommentSingle, nil},
@ -35,5 +39,5 @@ var Actionscript = internal.Register(MustNewLexer(
 			{`"(\\\\|\\"|[^"])*"`, LiteralStringDouble, nil},
 			{`'(\\\\|\\'|[^'])*'`, LiteralStringSingle, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/actionscript3.go
+++ b/lexers/a/actionscript3.go
@ -6,7 +6,7 @@ import (
 )

 // Actionscript 3 lexer.
-var Actionscript3 = internal.Register(MustNewLexer(
+var Actionscript3 = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "ActionScript 3",
 		Aliases:   []string{"as3", "actionscript3"},
@ -14,7 +14,11 @@ var Actionscript3 = internal.Register(MustNewLexer(
 		MimeTypes: []string{"application/x-actionscript3", "text/x-actionscript3", "text/actionscript3"},
 		DotAll:    true,
 	},
-	Rules{
+	actionscript3Rules,
+))
+
+func actionscript3Rules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`(function\s+)([$a-zA-Z_]\w*)(\s*)(\()`, ByGroups(KeywordDeclaration, NameFunction, Text, Operator), Push("funcparams")},
@ -52,5 +56,5 @@ var Actionscript3 = internal.Register(MustNewLexer(
 			{`,`, Operator, Pop(1)},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}
--- a/lexers/a/ada.go
+++ b/lexers/a/ada.go
@ -6,7 +6,7 @@ import (
 )

 // Ada lexer.
-var Ada = internal.Register(MustNewLexer(
+var Ada = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Ada",
 		Aliases:         []string{"ada", "ada95", "ada2005"},
@ -14,7 +14,11 @@ var Ada = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-ada"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	adaRules,
+))
+
+func adaRules() Rules {
+	return Rules{
 		"root": {
 			{`[^\S\n]+`, Text, nil},
 			{`--.*?\n`, CommentSingle, nil},
@ -110,5 +114,5 @@ var Ada = internal.Register(MustNewLexer(
 			{`\)`, Punctuation, Pop(1)},
 			Include("root"),
 		},
-	},
-))
+	}
+}
--- a/lexers/a/angular2.go
+++ b/lexers/a/angular2.go
@ -6,14 +6,18 @@ import (
 )

 // Angular2 lexer.
-var Angular2 = internal.Register(MustNewLexer(
+var Angular2 = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Angular2",
 		Aliases:   []string{"ng2"},
 		Filenames: []string{},
 		MimeTypes: []string{},
 	},
-	Rules{
+	angular2Rules,
+))
+
+func angular2Rules() Rules {
+	return Rules{
 		"root": {
 			{`[^{([*#]+`, Other, nil},
 			{`(\{\{)(\s*)`, ByGroups(CommentPreproc, Text), Push("ngExpression")},
@ -38,5 +42,5 @@ var Angular2 = internal.Register(MustNewLexer(
 			{`'.*?'`, LiteralString, Pop(1)},
 			{`[^\s>]+`, LiteralString, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/antlr.go
+++ b/lexers/a/antlr.go
@ -6,14 +6,18 @@ import (
 )

 // ANTLR lexer.
-var ANTLR = internal.Register(MustNewLexer(
+var ANTLR = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "ANTLR",
 		Aliases:   []string{"antlr"},
 		Filenames: []string{},
 		MimeTypes: []string{},
 	},
-	Rules{
+	antlrRules,
+))
+
+func antlrRules() Rules {
+	return Rules{
 		"whitespace": {
 			{`\s+`, TextWhitespace, nil},
 		},
@ -97,5 +101,5 @@ var ANTLR = internal.Register(MustNewLexer(
 			{`(\$[a-zA-Z]+)(\.?)(text|value)?`, ByGroups(NameVariable, Punctuation, NameProperty), nil},
 			{`(\\\\|\\\]|\\\[|[^\[\]])+`, Other, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/apache.go
+++ b/lexers/a/apache.go
@ -6,7 +6,7 @@ import (
 )

 // Apacheconf lexer.
-var Apacheconf = internal.Register(MustNewLexer(
+var Apacheconf = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "ApacheConf",
 		Aliases:         []string{"apacheconf", "aconf", "apache"},
@ -14,7 +14,11 @@ var Apacheconf = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-apacheconf"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	apacheconfRules,
+))
+
+func apacheconfRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`(#.*?)$`, Comment, nil},
@ -34,5 +38,5 @@ var Apacheconf = internal.Register(MustNewLexer(
 			{`"([^"\\]*(?:\\.[^"\\]*)*)"`, LiteralStringDouble, nil},
 			{`[^\s"\\]+`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/apl.go
+++ b/lexers/a/apl.go
@ -6,14 +6,18 @@ import (
 )

 // Apl lexer.
-var Apl = internal.Register(MustNewLexer(
+var Apl = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "APL",
 		Aliases:   []string{"apl"},
 		Filenames: []string{"*.apl"},
 		MimeTypes: []string{},
 	},
-	Rules{
+	aplRules,
+))
+
+func aplRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`[⍝#].*$`, CommentSingle, nil},
@ -32,5 +36,5 @@ var Apl = internal.Register(MustNewLexer(
 			{`[⍺⍵⍶⍹∇:]`, NameBuiltinPseudo, nil},
 			{`[{}]`, KeywordType, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/applescript.go
+++ b/lexers/a/applescript.go
@ -6,7 +6,7 @@ import (
 )

 // Applescript lexer.
-var Applescript = internal.Register(MustNewLexer(
+var Applescript = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "AppleScript",
 		Aliases:   []string{"applescript"},
@ -14,7 +14,11 @@ var Applescript = internal.Register(MustNewLexer(
 		MimeTypes: []string{},
 		DotAll:    true,
 	},
-	Rules{
+	applescriptRules,
+))
+
+func applescriptRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`¬\n`, LiteralStringEscape, nil},
@ -51,5 +55,5 @@ var Applescript = internal.Register(MustNewLexer(
 			{`[^*(]+`, CommentMultiline, nil},
 			{`[*(]`, CommentMultiline, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/arduino.go
+++ b/lexers/a/arduino.go
@ -6,7 +6,7 @@ import (
 )

 // Arduino lexer.
-var Arduino = internal.Register(MustNewLexer(
+var Arduino = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Arduino",
 		Aliases:   []string{"arduino"},
@ -14,7 +14,11 @@ var Arduino = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-arduino"},
 		EnsureNL:  true,
 	},
-	Rules{
+	arduinoRules,
+))
+
+func arduinoRules() Rules {
+	return Rules{
 		"statements": {
 			{Words(``, `\b`, `catch`, `const_cast`, `delete`, `dynamic_cast`, `explicit`, `export`, `friend`, `mutable`, `namespace`, `new`, `operator`, `private`, `protected`, `public`, `reinterpret_cast`, `restrict`, `static_cast`, `template`, `this`, `throw`, `throws`, `try`, `typeid`, `typename`, `using`, `virtual`, `constexpr`, `nullptr`, `decltype`, `thread_local`, `alignas`, `alignof`, `static_assert`, `noexcept`, `override`, `final`), Keyword, nil},
 			{`char(16_t|32_t)\b`, KeywordType, nil},
@ -106,5 +110,5 @@ var Arduino = internal.Register(MustNewLexer(
 			{`^\s*#endif.*?(?<!\\)\n`, CommentPreproc, Pop(1)},
 			{`.*?\n`, Comment, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/a/awk.go
+++ b/lexers/a/awk.go
@ -6,14 +6,18 @@ import (
 )

 // Awk lexer.
-var Awk = internal.Register(MustNewLexer(
+var Awk = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Awk",
 		Aliases:   []string{"awk", "gawk", "mawk", "nawk"},
 		Filenames: []string{"*.awk"},
 		MimeTypes: []string{"application/x-awk"},
 	},
-	Rules{
+	awkRules,
+))
+
+func awkRules() Rules {
+	return Rules{
 		"commentsandwhitespace": {
 			{`\s+`, Text, nil},
 			{`#.*$`, CommentSingle, nil},
@ -44,5 +48,5 @@ var Awk = internal.Register(MustNewLexer(
 			{`"(\\\\|\\"|[^"])*"`, LiteralStringDouble, nil},
 			{`'(\\\\|\\'|[^'])*'`, LiteralStringSingle, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/b/ballerina.go
+++ b/lexers/b/ballerina.go
@ -6,7 +6,7 @@ import (
 )

 // Ballerina lexer.
-var Ballerina = internal.Register(MustNewLexer(
+var Ballerina = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Ballerina",
 		Aliases:   []string{"ballerina"},
@ -14,7 +14,11 @@ var Ballerina = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-ballerina"},
 		DotAll:    true,
 	},
-	Rules{
+	ballerinaRules,
+))
+
+func ballerinaRules() Rules {
+	return Rules{
 		"root": {
 			{`[^\S\n]+`, Text, nil},
 			{`//.*?\n`, CommentSingle, nil},
@ -42,5 +46,5 @@ var Ballerina = internal.Register(MustNewLexer(
 		"import": {
 			{`[\w.]+`, NameNamespace, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/b/bash.go
+++ b/lexers/b/bash.go
@ -7,17 +7,27 @@ import (
 	"github.com/alecthomas/chroma/lexers/internal"
 )

+// TODO(moorereason): can this be factored away?
 var bashAnalyserRe = regexp.MustCompile(`(?m)^#!.*/bin/(?:env |)(?:bash|zsh|sh|ksh)`)

 // Bash lexer.
-var Bash = internal.Register(MustNewLexer(
+var Bash = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Bash",
 		Aliases:   []string{"bash", "sh", "ksh", "zsh", "shell"},
 		Filenames: []string{"*.sh", "*.ksh", "*.bash", "*.ebuild", "*.eclass", ".env", "*.env", "*.exheres-0", "*.exlib", "*.zsh", "*.zshrc", ".bashrc", "bashrc", ".bash_*", "bash_*", "zshrc", ".zshrc", "PKGBUILD"},
 		MimeTypes: []string{"application/x-sh", "application/x-shellscript"},
 	},
-	Rules{
+	bashRules,
+).SetAnalyser(func(text string) float32 {
+	if bashAnalyserRe.FindString(text) != "" {
+		return 1.0
+	}
+	return 0.0
+}))
+
+func bashRules() Rules {
+	return Rules{
 		"root": {
 			Include("basic"),
 			{"`", LiteralStringBacktick, Push("backticks")},
@ -86,10 +96,5 @@ var Bash = internal.Register(MustNewLexer(
 			{"`", LiteralStringBacktick, Pop(1)},
 			Include("root"),
 		},
-	},
-).SetAnalyser(func(text string) float32 {
-	if bashAnalyserRe.FindString(text) != "" {
-		return 1.0
 	}
-	return 0.0
-}))
+}
--- a/lexers/b/batch.go
+++ b/lexers/b/batch.go
@ -6,7 +6,7 @@ import (
 )

 // Batchfile lexer.
-var Batchfile = internal.Register(MustNewLexer(
+var Batchfile = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Batchfile",
 		Aliases:         []string{"bat", "batch", "dosbatch", "winbatch"},
@ -14,7 +14,11 @@ var Batchfile = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"application/x-dos-batch"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	batchfileRules,
+))
+
+func batchfileRules() Rules {
+	return Rules{
 		"root": {
 			{`\)((?=\()|(?=\^?[\t\v\f\r ,;=\xa0]|[&<>|\n\x1a]))(?:(?:[^\n\x1a^]|\^[\n\x1a]?[\w\W])*)`, CommentSingle, nil},
 			{`(?=((?:(?<=^[^:])|^[^:]?)[\t\v\f\r ,;=\xa0]*)(:))`, Text, Push("follow")},
@ -190,5 +194,5 @@ var Batchfile = internal.Register(MustNewLexer(
 			{`else(?=\^?[\t\v\f\r ,;=\xa0]|[&<>|\n\x1a])`, Keyword, Pop(1)},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}
--- a/lexers/b/bibtex.go
+++ b/lexers/b/bibtex.go
@ -6,7 +6,7 @@ import (
 )

 // Bibtex lexer.
-var Bibtex = internal.Register(MustNewLexer(
+var Bibtex = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "BibTeX",
 		Aliases:         []string{"bib", "bibtex"},
@ -15,7 +15,11 @@ var Bibtex = internal.Register(MustNewLexer(
 		NotMultiline:    true,
 		CaseInsensitive: true,
 	},
-	Rules{
+	bibtexRules,
+))
+
+func bibtexRules() Rules {
+	return Rules{
 		"root": {
 			Include("whitespace"),
 			{`@comment`, Comment, nil},
@ -72,5 +76,5 @@ var Bibtex = internal.Register(MustNewLexer(
 		"whitespace": {
 			{`\s+`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/b/blitz.go
+++ b/lexers/b/blitz.go
@ -6,7 +6,7 @@ import (
 )

 // Blitzbasic lexer.
-var Blitzbasic = internal.Register(MustNewLexer(
+var Blitzbasic = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "BlitzBasic",
 		Aliases:         []string{"blitzbasic", "b3d", "bplus"},
@ -14,7 +14,11 @@ var Blitzbasic = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-bb"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	blitzbasicRules,
+))
+
+func blitzbasicRules() Rules {
+	return Rules{
 		"root": {
 			{`[ \t]+`, Text, nil},
 			{`;.*?\n`, CommentSingle, nil},
@ -44,5 +48,5 @@ var Blitzbasic = internal.Register(MustNewLexer(
 			{`"C?`, LiteralStringDouble, Pop(1)},
 			{`[^"]+`, LiteralStringDouble, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/b/bnf.go
+++ b/lexers/b/bnf.go
@ -6,19 +6,23 @@ import (
 )

 // Bnf lexer.
-var Bnf = internal.Register(MustNewLexer(
+var Bnf = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "BNF",
 		Aliases:   []string{"bnf"},
 		Filenames: []string{"*.bnf"},
 		MimeTypes: []string{"text/x-bnf"},
 	},
-	Rules{
+	bnfRules,
+))
+
+func bnfRules() Rules {
+	return Rules{
 		"root": {
 			{`(<)([ -;=?-~]+)(>)`, ByGroups(Punctuation, NameClass, Punctuation), nil},
 			{`::=`, Operator, nil},
 			{`[^<>:]+`, Text, nil},
 			{`.`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/b/brainfuck.go
+++ b/lexers/b/brainfuck.go
@ -6,14 +6,18 @@ import (
 )

 // Brainfuck lexer.
-var Brainfuck = internal.Register(MustNewLexer(
+var Brainfuck = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Brainfuck",
 		Aliases:   []string{"brainfuck", "bf"},
 		Filenames: []string{"*.bf", "*.b"},
 		MimeTypes: []string{"application/x-brainfuck"},
 	},
-	Rules{
+	brainfuckRules,
+))
+
+func brainfuckRules() Rules {
+	return Rules{
 		"common": {
 			{`[.,]+`, NameTag, nil},
 			{`[+-]+`, NameBuiltin, nil},
@ -30,5 +34,5 @@ var Brainfuck = internal.Register(MustNewLexer(
 			{`\]`, Keyword, Pop(1)},
 			Include("common"),
 		},
-	},
-))
+	}
+}
--- a/lexers/c/c.go
+++ b/lexers/c/c.go
@ -6,7 +6,7 @@ import (
 )

 // C lexer.
-var C = internal.Register(MustNewLexer(
+var C = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "C",
 		Aliases:   []string{"c"},
@ -14,7 +14,11 @@ var C = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-chdr", "text/x-csrc"},
 		EnsureNL:  true,
 	},
-	Rules{
+	cRules,
+))
+
+func cRules() Rules {
+	return Rules{
 		"whitespace": {
 			{`^#if\s+0`, CommentPreproc, Push("if0")},
 			{`^#`, CommentPreproc, Push("macro")},
@ -88,5 +92,5 @@ var C = internal.Register(MustNewLexer(
 			{`^\s*#endif.*?(?<!\\)\n`, CommentPreproc, Pop(1)},
 			{`.*?\n`, Comment, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/caddyfile.go
+++ b/lexers/c/caddyfile.go
@ -6,143 +6,149 @@ import (
 )

 // caddyfileCommon are the rules common to both of the lexer variants
-var caddyfileCommon = Rules{
-	"site_block_common": {
-		// Import keyword
-		{`(import)(\s+)([^\s]+)`, ByGroups(Keyword, Text, NameVariableMagic), nil},
-		// Matcher definition
-		{`@[^\s]+(?=\s)`, NameDecorator, Push("matcher")},
-		// Matcher token stub for docs
-		{`\[\<matcher\>\]`, NameDecorator, Push("matcher")},
-		// These cannot have matchers but may have things that look like
-		// matchers in their arguments, so we just parse as a subdirective.
-		{`try_files`, Keyword, Push("subdirective")},
-		// These are special, they can nest more directives
-		{`handle_errors|handle|route|handle_path|not`, Keyword, Push("nested_directive")},
-		// Any other directive
-		{`[^\s#]+`, Keyword, Push("directive")},
-		Include("base"),
-	},
-	"matcher": {
-		{`\{`, Punctuation, Push("block")},
-		// Not can be one-liner
-		{`not`, Keyword, Push("deep_not_matcher")},
-		// Any other same-line matcher
-		{`[^\s#]+`, Keyword, Push("arguments")},
-		// Terminators
-		{`\n`, Text, Pop(1)},
-		{`\}`, Punctuation, Pop(1)},
-		Include("base"),
-	},
-	"block": {
-		{`\}`, Punctuation, Pop(2)},
-		// Not can be one-liner
-		{`not`, Keyword, Push("not_matcher")},
-		// Any other subdirective
-		{`[^\s#]+`, Keyword, Push("subdirective")},
-		Include("base"),
-	},
-	"nested_block": {
-		{`\}`, Punctuation, Pop(2)},
-		// Matcher definition
-		{`@[^\s]+(?=\s)`, NameDecorator, Push("matcher")},
-		// Something that starts with literally < is probably a docs stub
-		{`\<[^#]+\>`, Keyword, Push("nested_directive")},
-		// Any other directive
-		{`[^\s#]+`, Keyword, Push("nested_directive")},
-		Include("base"),
-	},
-	"not_matcher": {
-		{`\}`, Punctuation, Pop(2)},
-		{`\{(?=\s)`, Punctuation, Push("block")},
-		{`[^\s#]+`, Keyword, Push("arguments")},
-		{`\s+`, Text, nil},
-	},
-	"deep_not_matcher": {
-		{`\}`, Punctuation, Pop(2)},
-		{`\{(?=\s)`, Punctuation, Push("block")},
-		{`[^\s#]+`, Keyword, Push("deep_subdirective")},
-		{`\s+`, Text, nil},
-	},
-	"directive": {
-		{`\{(?=\s)`, Punctuation, Push("block")},
-		Include("matcher_token"),
-		Include("comments_pop_1"),
-		{`\n`, Text, Pop(1)},
-		Include("base"),
-	},
-	"nested_directive": {
-		{`\{(?=\s)`, Punctuation, Push("nested_block")},
-		Include("matcher_token"),
-		Include("comments_pop_1"),
-		{`\n`, Text, Pop(1)},
-		Include("base"),
-	},
-	"subdirective": {
-		{`\{(?=\s)`, Punctuation, Push("block")},
-		Include("comments_pop_1"),
-		{`\n`, Text, Pop(1)},
-		Include("base"),
-	},
-	"arguments": {
-		{`\{(?=\s)`, Punctuation, Push("block")},
-		Include("comments_pop_2"),
-		{`\\\n`, Text, nil}, // Skip escaped newlines
-		{`\n`, Text, Pop(2)},
-		Include("base"),
-	},
-	"deep_subdirective": {
-		{`\{(?=\s)`, Punctuation, Push("block")},
-		Include("comments_pop_3"),
-		{`\n`, Text, Pop(3)},
-		Include("base"),
-	},
-	"matcher_token": {
-		{`@[^\s]+`, NameDecorator, Push("arguments")},         // Named matcher
-		{`/[^\s]+`, NameDecorator, Push("arguments")},         // Path matcher
-		{`\*`, NameDecorator, Push("arguments")},              // Wildcard path matcher
-		{`\[\<matcher\>\]`, NameDecorator, Push("arguments")}, // Matcher token stub for docs
-	},
-	"comments": {
-		{`^#.*\n`, CommentSingle, nil},   // Comment at start of line
-		{`\s+#.*\n`, CommentSingle, nil}, // Comment preceded by whitespace
-	},
-	"comments_pop_1": {
-		{`^#.*\n`, CommentSingle, Pop(1)},   // Comment at start of line
-		{`\s+#.*\n`, CommentSingle, Pop(1)}, // Comment preceded by whitespace
-	},
-	"comments_pop_2": {
-		{`^#.*\n`, CommentSingle, Pop(2)},   // Comment at start of line
-		{`\s+#.*\n`, CommentSingle, Pop(2)}, // Comment preceded by whitespace
-	},
-	"comments_pop_3": {
-		{`^#.*\n`, CommentSingle, Pop(3)},   // Comment at start of line
-		{`\s+#.*\n`, CommentSingle, Pop(3)}, // Comment preceded by whitespace
-	},
-	"base": {
-		Include("comments"),
-		{`(on|off|first|last|before|after|internal|strip_prefix|strip_suffix|replace)\b`, NameConstant, nil},
-		{`(https?://)?([a-z0-9.-]+)(:)([0-9]+)`, ByGroups(Name, Name, Punctuation, LiteralNumberInteger), nil},
-		{`[a-z-]+/[a-z-+]+`, LiteralString, nil},
-		{`[0-9]+[km]?\b`, LiteralNumberInteger, nil},
-		{`\{[\w+.\$-]+\}`, LiteralStringEscape, nil}, // Placeholder
-		{`\[(?=[^#{}$]+\])`, Punctuation, nil},
-		{`\]|\|`, Punctuation, nil},
-		{`[^\s#{}$\]]+`, LiteralString, nil},
-		{`/[^\s#]*`, Name, nil},
-		{`\s+`, Text, nil},
-	},
+func caddyfileCommonRules() Rules {
+	return Rules{
+		"site_block_common": {
+			// Import keyword
+			{`(import)(\s+)([^\s]+)`, ByGroups(Keyword, Text, NameVariableMagic), nil},
+			// Matcher definition
+			{`@[^\s]+(?=\s)`, NameDecorator, Push("matcher")},
+			// Matcher token stub for docs
+			{`\[\<matcher\>\]`, NameDecorator, Push("matcher")},
+			// These cannot have matchers but may have things that look like
+			// matchers in their arguments, so we just parse as a subdirective.
+			{`try_files`, Keyword, Push("subdirective")},
+			// These are special, they can nest more directives
+			{`handle_errors|handle|route|handle_path|not`, Keyword, Push("nested_directive")},
+			// Any other directive
+			{`[^\s#]+`, Keyword, Push("directive")},
+			Include("base"),
+		},
+		"matcher": {
+			{`\{`, Punctuation, Push("block")},
+			// Not can be one-liner
+			{`not`, Keyword, Push("deep_not_matcher")},
+			// Any other same-line matcher
+			{`[^\s#]+`, Keyword, Push("arguments")},
+			// Terminators
+			{`\n`, Text, Pop(1)},
+			{`\}`, Punctuation, Pop(1)},
+			Include("base"),
+		},
+		"block": {
+			{`\}`, Punctuation, Pop(2)},
+			// Not can be one-liner
+			{`not`, Keyword, Push("not_matcher")},
+			// Any other subdirective
+			{`[^\s#]+`, Keyword, Push("subdirective")},
+			Include("base"),
+		},
+		"nested_block": {
+			{`\}`, Punctuation, Pop(2)},
+			// Matcher definition
+			{`@[^\s]+(?=\s)`, NameDecorator, Push("matcher")},
+			// Something that starts with literally < is probably a docs stub
+			{`\<[^#]+\>`, Keyword, Push("nested_directive")},
+			// Any other directive
+			{`[^\s#]+`, Keyword, Push("nested_directive")},
+			Include("base"),
+		},
+		"not_matcher": {
+			{`\}`, Punctuation, Pop(2)},
+			{`\{(?=\s)`, Punctuation, Push("block")},
+			{`[^\s#]+`, Keyword, Push("arguments")},
+			{`\s+`, Text, nil},
+		},
+		"deep_not_matcher": {
+			{`\}`, Punctuation, Pop(2)},
+			{`\{(?=\s)`, Punctuation, Push("block")},
+			{`[^\s#]+`, Keyword, Push("deep_subdirective")},
+			{`\s+`, Text, nil},
+		},
+		"directive": {
+			{`\{(?=\s)`, Punctuation, Push("block")},
+			Include("matcher_token"),
+			Include("comments_pop_1"),
+			{`\n`, Text, Pop(1)},
+			Include("base"),
+		},
+		"nested_directive": {
+			{`\{(?=\s)`, Punctuation, Push("nested_block")},
+			Include("matcher_token"),
+			Include("comments_pop_1"),
+			{`\n`, Text, Pop(1)},
+			Include("base"),
+		},
+		"subdirective": {
+			{`\{(?=\s)`, Punctuation, Push("block")},
+			Include("comments_pop_1"),
+			{`\n`, Text, Pop(1)},
+			Include("base"),
+		},
+		"arguments": {
+			{`\{(?=\s)`, Punctuation, Push("block")},
+			Include("comments_pop_2"),
+			{`\\\n`, Text, nil}, // Skip escaped newlines
+			{`\n`, Text, Pop(2)},
+			Include("base"),
+		},
+		"deep_subdirective": {
+			{`\{(?=\s)`, Punctuation, Push("block")},
+			Include("comments_pop_3"),
+			{`\n`, Text, Pop(3)},
+			Include("base"),
+		},
+		"matcher_token": {
+			{`@[^\s]+`, NameDecorator, Push("arguments")},         // Named matcher
+			{`/[^\s]+`, NameDecorator, Push("arguments")},         // Path matcher
+			{`\*`, NameDecorator, Push("arguments")},              // Wildcard path matcher
+			{`\[\<matcher\>\]`, NameDecorator, Push("arguments")}, // Matcher token stub for docs
+		},
+		"comments": {
+			{`^#.*\n`, CommentSingle, nil},   // Comment at start of line
+			{`\s+#.*\n`, CommentSingle, nil}, // Comment preceded by whitespace
+		},
+		"comments_pop_1": {
+			{`^#.*\n`, CommentSingle, Pop(1)},   // Comment at start of line
+			{`\s+#.*\n`, CommentSingle, Pop(1)}, // Comment preceded by whitespace
+		},
+		"comments_pop_2": {
+			{`^#.*\n`, CommentSingle, Pop(2)},   // Comment at start of line
+			{`\s+#.*\n`, CommentSingle, Pop(2)}, // Comment preceded by whitespace
+		},
+		"comments_pop_3": {
+			{`^#.*\n`, CommentSingle, Pop(3)},   // Comment at start of line
+			{`\s+#.*\n`, CommentSingle, Pop(3)}, // Comment preceded by whitespace
+		},
+		"base": {
+			Include("comments"),
+			{`(on|off|first|last|before|after|internal|strip_prefix|strip_suffix|replace)\b`, NameConstant, nil},
+			{`(https?://)?([a-z0-9.-]+)(:)([0-9]+)`, ByGroups(Name, Name, Punctuation, LiteralNumberInteger), nil},
+			{`[a-z-]+/[a-z-+]+`, LiteralString, nil},
+			{`[0-9]+[km]?\b`, LiteralNumberInteger, nil},
+			{`\{[\w+.\$-]+\}`, LiteralStringEscape, nil}, // Placeholder
+			{`\[(?=[^#{}$]+\])`, Punctuation, nil},
+			{`\]|\|`, Punctuation, nil},
+			{`[^\s#{}$\]]+`, LiteralString, nil},
+			{`/[^\s#]*`, Name, nil},
+			{`\s+`, Text, nil},
+		},
+	}
 }

 // Caddyfile lexer.
-var Caddyfile = internal.Register(MustNewLexer(
+var Caddyfile = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Caddyfile",
 		Aliases:   []string{"caddyfile", "caddy"},
 		Filenames: []string{"Caddyfile*"},
 		MimeTypes: []string{},
 	},
-	Rules{
+	caddyfileRules,
+))
+
+func caddyfileRules() Rules {
+	return Rules{
 		"root": {
 			Include("comments"),
 			// Global options block
@ -186,21 +192,25 @@ var Caddyfile = internal.Register(MustNewLexer(
 			{`\}`, Punctuation, Pop(2)},
 			Include("site_block_common"),
 		},
-	}.Merge(caddyfileCommon),
-))
+	}.Merge(caddyfileCommonRules())
+}

 // Caddyfile directive-only lexer.
-var CaddyfileDirectives = internal.Register(MustNewLexer(
+var CaddyfileDirectives = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Caddyfile Directives",
 		Aliases:   []string{"caddyfile-directives", "caddyfile-d", "caddy-d"},
 		Filenames: []string{},
 		MimeTypes: []string{},
 	},
-	Rules{
+	caddyfileDirectivesRules,
+))
+
+func caddyfileDirectivesRules() Rules {
+	return Rules{
 		// Same as "site_block" in Caddyfile
 		"root": {
 			Include("site_block_common"),
 		},
-	}.Merge(caddyfileCommon),
-))
+	}.Merge(caddyfileCommonRules())
+}
--- a/lexers/c/capnproto.go
+++ b/lexers/c/capnproto.go
@ -6,14 +6,18 @@ import (
 )

 // Cap'N'Proto Proto lexer.
-var CapNProto = internal.Register(MustNewLexer(
+var CapNProto = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Cap'n Proto",
 		Aliases:   []string{"capnp"},
 		Filenames: []string{"*.capnp"},
 		MimeTypes: []string{},
 	},
-	Rules{
+	capNProtoRules,
+))
+
+func capNProtoRules() Rules {
+	return Rules{
 		"root": {
 			{`#.*?$`, CommentSingle, nil},
 			{`@[0-9a-zA-Z]*`, NameDecorator, nil},
@ -57,5 +61,5 @@ var CapNProto = internal.Register(MustNewLexer(
 			{`[])]`, NameAttribute, Pop(1)},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}
--- a/lexers/c/ceylon.go
+++ b/lexers/c/ceylon.go
@ -6,7 +6,7 @@ import (
 )

 // Ceylon lexer.
-var Ceylon = internal.Register(MustNewLexer(
+var Ceylon = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Ceylon",
 		Aliases:   []string{"ceylon"},
@ -14,7 +14,11 @@ var Ceylon = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-ceylon"},
 		DotAll:    true,
 	},
-	Rules{
+	ceylonRules,
+))
+
+func ceylonRules() Rules {
+	return Rules{
 		"root": {
 			{`^(\s*(?:[a-zA-Z_][\w.\[\]]*\s+)+?)([a-zA-Z_]\w*)(\s*)(\()`, ByGroups(UsingSelf("root"), NameFunction, Text, Operator), nil},
 			{`[^\S\n]+`, Text, nil},
@ -59,5 +63,5 @@ var Ceylon = internal.Register(MustNewLexer(
 			{`\*/`, CommentMultiline, Pop(1)},
 			{`[*/]`, CommentMultiline, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cfengine3.go
+++ b/lexers/c/cfengine3.go
@ -6,14 +6,18 @@ import (
 )

 // Cfengine3 lexer.
-var Cfengine3 = internal.Register(MustNewLexer(
+var Cfengine3 = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "CFEngine3",
 		Aliases:   []string{"cfengine3", "cf3"},
 		Filenames: []string{"*.cf"},
 		MimeTypes: []string{},
 	},
-	Rules{
+	cfengine3Rules,
+))
+
+func cfengine3Rules() Rules {
+	return Rules{
 		"root": {
 			{`#.*?\n`, Comment, nil},
 			{`(body)(\s+)(\S+)(\s+)(control)`, ByGroups(Keyword, Text, Keyword, Text, Keyword), nil},
@ -52,5 +56,5 @@ var Cfengine3 = internal.Register(MustNewLexer(
 			{`\w+`, NameVariable, nil},
 			{`\s+`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/chaiscript.go
+++ b/lexers/c/chaiscript.go
@ -6,7 +6,7 @@ import (
 )

 // Chaiscript lexer.
-var Chaiscript = internal.Register(MustNewLexer(
+var Chaiscript = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "ChaiScript",
 		Aliases:   []string{"chai", "chaiscript"},
@ -14,7 +14,11 @@ var Chaiscript = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-chaiscript", "application/x-chaiscript"},
 		DotAll:    true,
 	},
-	Rules{
+	chaiscriptRules,
+))
+
+func chaiscriptRules() Rules {
+	return Rules{
 		"commentsandwhitespace": {
 			{`\s+`, Text, nil},
 			{`//.*?\n`, CommentSingle, nil},
@ -59,5 +63,5 @@ var Chaiscript = internal.Register(MustNewLexer(
 			{`[^\\"$]+`, LiteralStringDouble, nil},
 			{`"`, LiteralStringDouble, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cheetah.go
+++ b/lexers/c/cheetah.go
@ -7,14 +7,18 @@ import (
 )

 // Cheetah lexer.
-var Cheetah = internal.Register(MustNewLexer(
+var Cheetah = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Cheetah",
 		Aliases:   []string{"cheetah", "spitfire"},
 		Filenames: []string{"*.tmpl", "*.spt"},
 		MimeTypes: []string{"application/x-cheetah", "application/x-spitfire"},
 	},
-	Rules{
+	cheetahRules,
+))
+
+func cheetahRules() Rules {
+	return Rules{
 		"root": {
 			{`(##[^\n]*)$`, ByGroups(Comment), nil},
 			{`#[*](.|\n)*?[*]#`, Comment, nil},
@ -33,5 +37,5 @@ var Cheetah = internal.Register(MustNewLexer(
            `, Other, nil},
 			{`\s+`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cl.go
+++ b/lexers/c/cl.go
@ -230,7 +230,7 @@ var (
 )

 // Common Lisp lexer.
-var CommonLisp = internal.Register(TypeRemappingLexer(MustNewLexer(
+var CommonLisp = internal.Register(TypeRemappingLexer(MustNewLazyLexer(
 	&Config{
 		Name:            "Common Lisp",
 		Aliases:         []string{"common-lisp", "cl", "lisp"},
@ -238,7 +238,19 @@ var CommonLisp = internal.Register(TypeRemappingLexer(MustNewLexer(
 		MimeTypes:       []string{"text/x-common-lisp"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	commonLispRules,
+), TypeMapping{
+	{NameVariable, NameFunction, clBuiltinFunctions},
+	{NameVariable, Keyword, clSpecialForms},
+	{NameVariable, NameBuiltin, clMacros},
+	{NameVariable, Keyword, clLambdaListKeywords},
+	{NameVariable, Keyword, clDeclarations},
+	{NameVariable, KeywordType, clBuiltinTypes},
+	{NameVariable, NameClass, clBuiltinClasses},
+}))
+
+func commonLispRules() Rules {
+	return Rules{
 		"root": {
 			Default(Push("body")),
 		},
@ -294,13 +306,5 @@ var CommonLisp = internal.Register(TypeRemappingLexer(MustNewLexer(
 			{`\(`, Punctuation, Push("body")},
 			{`\)`, Punctuation, Pop(1)},
 		},
-	},
-), TypeMapping{
-	{NameVariable, NameFunction, clBuiltinFunctions},
-	{NameVariable, Keyword, clSpecialForms},
-	{NameVariable, NameBuiltin, clMacros},
-	{NameVariable, Keyword, clLambdaListKeywords},
-	{NameVariable, Keyword, clDeclarations},
-	{NameVariable, KeywordType, clBuiltinTypes},
-	{NameVariable, NameClass, clBuiltinClasses},
-}))
+	}
+}
--- a/lexers/c/clojure.go
+++ b/lexers/c/clojure.go
@ -6,14 +6,18 @@ import (
 )

 // Clojure lexer.
-var Clojure = internal.Register(MustNewLexer(
+var Clojure = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Clojure",
 		Aliases:   []string{"clojure", "clj"},
 		Filenames: []string{"*.clj"},
 		MimeTypes: []string{"text/x-clojure", "application/x-clojure"},
 	},
-	Rules{
+	clojureRules,
+))
+
+func clojureRules() Rules {
+	return Rules{
 		"root": {
 			{`;.*$`, CommentSingle, nil},
 			{`[,\s]+`, Text, nil},
@ -34,5 +38,5 @@ var Clojure = internal.Register(MustNewLexer(
 			{`(\{|\})`, Punctuation, nil},
 			{`(\(|\))`, Punctuation, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cmake.go
+++ b/lexers/c/cmake.go
@ -6,14 +6,18 @@ import (
 )

 // Cmake lexer.
-var Cmake = internal.Register(MustNewLexer(
+var Cmake = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "CMake",
 		Aliases:   []string{"cmake"},
 		Filenames: []string{"*.cmake", "CMakeLists.txt"},
 		MimeTypes: []string{"text/x-cmake"},
 	},
-	Rules{
+	cmakeRules,
+))
+
+func cmakeRules() Rules {
+	return Rules{
 		"root": {
 			{`\b(\w+)([ \t]*)(\()`, ByGroups(NameBuiltin, Text, Punctuation), Push("args")},
 			Include("keywords"),
@ -40,5 +44,5 @@ var Cmake = internal.Register(MustNewLexer(
 			{`[ \t]+`, Text, nil},
 			{`#.*\n`, Comment, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cobol.go
+++ b/lexers/c/cobol.go
@ -6,7 +6,7 @@ import (
 )

 // Cobol lexer.
-var Cobol = internal.Register(MustNewLexer(
+var Cobol = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "COBOL",
 		Aliases:         []string{"cobol"},
@ -14,7 +14,11 @@ var Cobol = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-cobol"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	cobolRules,
+))
+
+func cobolRules() Rules {
+	return Rules{
 		"root": {
 			Include("comment"),
 			Include("strings"),
@ -47,5 +51,5 @@ var Cobol = internal.Register(MustNewLexer(
 			{`[+-]?\d*\.\d+(E[-+]?\d+)?`, LiteralNumberFloat, nil},
 			{`[+-]?\d+\.\d*(E[-+]?\d+)?`, LiteralNumberFloat, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/coffee.go
+++ b/lexers/c/coffee.go
@ -6,7 +6,7 @@ import (
 )

 // Coffeescript lexer.
-var Coffeescript = internal.Register(MustNewLexer(
+var Coffeescript = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:         "CoffeeScript",
 		Aliases:      []string{"coffee-script", "coffeescript", "coffee"},
@ -15,7 +15,11 @@ var Coffeescript = internal.Register(MustNewLexer(
 		NotMultiline: true,
 		DotAll:       true,
 	},
-	Rules{
+	coffeescriptRules,
+))
+
+func coffeescriptRules() Rules {
+	return Rules{
 		"commentsandwhitespace": {
 			{`\s+`, Text, nil},
 			{`###[^#].*?###`, CommentMultiline, nil},
@ -87,5 +91,5 @@ var Coffeescript = internal.Register(MustNewLexer(
 			{`#|\\.|\'|"`, LiteralString, nil},
 			Include("strings"),
 		},
-	},
-))
+	}
+}
--- a/lexers/c/coldfusion.go
+++ b/lexers/c/coldfusion.go
@ -6,7 +6,7 @@ import (
 )

 // Cfstatement lexer.
-var Cfstatement = internal.Register(MustNewLexer(
+var Cfstatement = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "cfstatement",
 		Aliases:         []string{"cfs"},
@ -15,7 +15,11 @@ var Cfstatement = internal.Register(MustNewLexer(
 		NotMultiline:    true,
 		CaseInsensitive: true,
 	},
-	Rules{
+	cfstatementRules,
+))
+
+func cfstatementRules() Rules {
+	return Rules{
 		"root": {
 			{`//.*?\n`, CommentSingle, nil},
 			{`/\*(?:.|\n)*?\*/`, CommentMultiline, nil},
@ -44,5 +48,5 @@ var Cfstatement = internal.Register(MustNewLexer(
 			{`#`, LiteralStringDouble, nil},
 			{`"`, LiteralStringDouble, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/coq.go
+++ b/lexers/c/coq.go
@ -6,14 +6,18 @@ import (
 )

 // Coq lexer.
-var Coq = internal.Register(MustNewLexer(
+var Coq = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Coq",
 		Aliases:   []string{"coq"},
 		Filenames: []string{"*.v"},
 		MimeTypes: []string{"text/x-coq"},
 	},
-	Rules{
+	coqRules,
+))
+
+func coqRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`false|true|\(\)|\[\]`, NameBuiltinPseudo, nil},
@ -59,5 +63,5 @@ var Coq = internal.Register(MustNewLexer(
 			{`[a-z][a-z0-9_\']*`, Name, Pop(1)},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cpp.go
+++ b/lexers/c/cpp.go
@ -6,7 +6,7 @@ import (
 )

 // CPP lexer.
-var CPP = internal.Register(MustNewLexer(
+var CPP = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "C++",
 		Aliases:   []string{"cpp", "c++"},
@ -14,7 +14,11 @@ var CPP = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-c++hdr", "text/x-c++src"},
 		EnsureNL:  true,
 	},
-	Rules{
+	cppRules,
+))
+
+func cppRules() Rules {
+	return Rules{
 		"statements": {
 			{Words(``, `\b`, `catch`, `const_cast`, `delete`, `dynamic_cast`, `explicit`, `export`, `friend`, `mutable`, `namespace`, `new`, `operator`, `private`, `protected`, `public`, `reinterpret_cast`, `restrict`, `static_cast`, `template`, `this`, `throw`, `throws`, `try`, `typeid`, `typename`, `using`, `virtual`, `constexpr`, `nullptr`, `decltype`, `thread_local`, `alignas`, `alignof`, `static_assert`, `noexcept`, `override`, `final`, `concept`, `requires`, `consteval`, `co_await`, `co_return`, `co_yield`), Keyword, nil},
 			{`(enum)\b(\s+)(class)\b(\s*)`, ByGroups(Keyword, Text, Keyword, Text), Push("classname")},
@ -102,5 +106,5 @@ var CPP = internal.Register(MustNewLexer(
 			{`^\s*#endif.*?(?<!\\)\n`, CommentPreproc, Pop(1)},
 			{`.*?\n`, Comment, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cql.go
+++ b/lexers/c/cql.go
@ -6,7 +6,7 @@ import (
 )

 // CassandraCQL lexer.
-var CassandraCQL = internal.Register(MustNewLexer(
+var CassandraCQL = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Cassandra CQL",
 		Aliases:         []string{"cassandra", "cql"},
@ -15,7 +15,11 @@ var CassandraCQL = internal.Register(MustNewLexer(
 		NotMultiline:    true,
 		CaseInsensitive: true,
 	},
-	Rules{
+	cassandraCQLRules,
+))
+
+func cassandraCQLRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, TextWhitespace, nil},
 			{`(--|\/\/).*\n?`, CommentSingle, nil},
@ -23,7 +27,8 @@ var CassandraCQL = internal.Register(MustNewLexer(
 			{`(ascii|bigint|blob|boolean|counter|date|decimal|double|float|frozen|inet|int|list|map|set|smallint|text|time|timestamp|timeuuid|tinyint|tuple|uuid|varchar|varint)\b`, NameBuiltin, nil},
 			{Words(``, `\b`, `ADD`, `AGGREGATE`, `ALL`, `ALLOW`, `ALTER`, `AND`, `ANY`, `APPLY`, `AS`, `ASC`, `AUTHORIZE`, `BATCH`, `BEGIN`, `BY`, `CLUSTERING`, `COLUMNFAMILY`, `COMPACT`, `CONSISTENCY`, `COUNT`, `CREATE`, `CUSTOM`, `DELETE`, `DESC`, `DISTINCT`, `DROP`, `EACH_QUORUM`, `ENTRIES`, `EXISTS`, `FILTERING`, `FROM`, `FULL`, `GRANT`, `IF`, `IN`, `INDEX`, `INFINITY`, `INSERT`, `INTO`, `KEY`, `KEYS`, `KEYSPACE`, `KEYSPACES`, `LEVEL`, `LIMIT`, `LOCAL_ONE`, `LOCAL_QUORUM`, `MATERIALIZED`, `MODIFY`, `NAN`, `NORECURSIVE`, `NOSUPERUSER`, `NOT`, `OF`, `ON`, `ONE`, `ORDER`, `PARTITION`, `PASSWORD`, `PER`, `PERMISSION`, `PERMISSIONS`, `PRIMARY`, `QUORUM`, `RENAME`, `REVOKE`, `SCHEMA`, `SELECT`, `STATIC`, `STORAGE`, `SUPERUSER`, `TABLE`, `THREE`, `TO`, `TOKEN`, `TRUNCATE`, `TTL`, `TWO`, `TYPE`, `UNLOGGED`, `UPDATE`, `USE`, `USER`, `USERS`, `USING`, `VALUES`, `VIEW`, `WHERE`, `WITH`, `WRITETIME`, `REPLICATION`, `OR`, `REPLACE`, `FUNCTION`, `CALLED`, `INPUT`, `RETURNS`, `LANGUAGE`, `ROLE`, `ROLES`, `TRIGGER`, `DURABLE_WRITES`, `LOGIN`, `OPTIONS`, `LOGGED`, `SFUNC`, `STYPE`, `FINALFUNC`, `INITCOND`, `IS`, `CONTAINS`, `JSON`, `PAGING`, `OFF`), Keyword, nil},
 			{"[+*/<>=~!@#%^&|`?-]+", Operator, nil},
-			{`(?s)(java|javascript)(\s+)(AS)(\s+)('|\$\$)(.*?)(\5)`,
+			{
+				`(?s)(java|javascript)(\s+)(AS)(\s+)('|\$\$)(.*?)(\5)`,
 				UsingByGroup(
 					internal.Get,
 					1, 6,
@ -65,5 +70,5 @@ var CassandraCQL = internal.Register(MustNewLexer(
 			{`[^\$]+`, LiteralStringHeredoc, nil},
 			{`\$\$`, LiteralStringHeredoc, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/crystal.go
+++ b/lexers/c/crystal.go
@ -6,7 +6,7 @@ import (
 )

 // Crystal lexer.
-var Crystal = internal.Register(MustNewLexer(
+var Crystal = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Crystal",
 		Aliases:   []string{"cr", "crystal"},
@ -14,7 +14,11 @@ var Crystal = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-crystal"},
 		DotAll:    true,
 	},
-	Rules{
+	crystalRules,
+))
+
+func crystalRules() Rules {
+	return Rules{
 		"root": {
 			{`#.*?$`, CommentSingle, nil},
 			{Words(``, `\b`, `abstract`, `asm`, `as`, `begin`, `break`, `case`, `do`, `else`, `elsif`, `end`, `ensure`, `extend`, `ifdef`, `if`, `include`, `instance_sizeof`, `next`, `of`, `pointerof`, `private`, `protected`, `rescue`, `return`, `require`, `sizeof`, `super`, `then`, `typeof`, `unless`, `until`, `when`, `while`, `with`, `yield`), Keyword, nil},
@ -258,5 +262,5 @@ var Crystal = internal.Register(MustNewLexer(
 			{`[\\#<>]`, LiteralStringRegex, nil},
 			{`[^\\#<>]+`, LiteralStringRegex, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/csharp.go
+++ b/lexers/c/csharp.go
@ -6,7 +6,7 @@ import (
 )

 // CSharp lexer.
-var CSharp = internal.Register(MustNewLexer(
+var CSharp = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "C#",
 		Aliases:   []string{"csharp", "c#"},
@ -15,7 +15,11 @@ var CSharp = internal.Register(MustNewLexer(
 		DotAll:    true,
 		EnsureNL:  true,
 	},
-	Rules{
+	cSharpRules,
+))
+
+func cSharpRules() Rules {
+	return Rules{
 		"root": {
 			{`^\s*\[.*?\]`, NameAttribute, nil},
 			{`[^\S\n]+`, Text, nil},
@ -47,5 +51,5 @@ var CSharp = internal.Register(MustNewLexer(
 			{`(?=\()`, Text, Pop(1)},
 			{`(@?[_a-zA-Z]\w*|\.)+`, NameNamespace, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/c/css.go
+++ b/lexers/c/css.go
@ -6,14 +6,18 @@ import (
 )

 // CSS lexer.
-var CSS = internal.Register(MustNewLexer(
+var CSS = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "CSS",
 		Aliases:   []string{"css"},
 		Filenames: []string{"*.css"},
 		MimeTypes: []string{"text/css"},
 	},
-	Rules{
+	cssRules,
+))
+
+func cssRules() Rules {
+	return Rules{
 		"root": {
 			Include("basics"),
 		},
@ -113,5 +117,5 @@ var CSS = internal.Register(MustNewLexer(
 			{`%`, KeywordType, nil},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}
--- a/lexers/c/cython.go
+++ b/lexers/c/cython.go
@ -6,14 +6,18 @@ import (
 )

 // Cython lexer.
-var Cython = internal.Register(MustNewLexer(
+var Cython = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Cython",
 		Aliases:   []string{"cython", "pyx", "pyrex"},
 		Filenames: []string{"*.pyx", "*.pxd", "*.pxi"},
 		MimeTypes: []string{"text/x-cython", "application/x-cython"},
 	},
-	Rules{
+	cythonRules,
+))
+
+func cythonRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			{`^(\s*)("""(?:.|\n)*?""")`, ByGroups(Text, LiteralStringDoc), nil},
@ -131,5 +135,5 @@ var Cython = internal.Register(MustNewLexer(
 			Include("strings"),
 			Include("nl"),
 		},
-	},
-))
+	}
+}
--- a/lexers/circular/php.go
+++ b/lexers/circular/php.go
@ -6,7 +6,7 @@ import (
 )

 // PHP lexer for pure PHP code (not embedded in HTML).
-var PHP = internal.Register(MustNewLexer(
+var PHP = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "PHP",
 		Aliases:         []string{"php", "php3", "php4", "php5"},
@ -16,65 +16,71 @@ var PHP = internal.Register(MustNewLexer(
 		CaseInsensitive: true,
 		EnsureNL:        true,
 	},
-	phpCommonRules.Rename("php", "root"),
+	phpRules,
 ))

-var phpCommonRules = Rules{
-	"php": {
-		{`\?>`, CommentPreproc, Pop(1)},
-		{`(<<<)([\'"]?)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)(\2\n.*?\n\s*)(\3)(;?)(\n)`, ByGroups(LiteralString, LiteralString, LiteralStringDelimiter, LiteralString, LiteralStringDelimiter, Punctuation, Text), nil},
-		{`\s+`, Text, nil},
-		{`#.*?\n`, CommentSingle, nil},
-		{`//.*?\n`, CommentSingle, nil},
-		{`/\*\*/`, CommentMultiline, nil},
-		{`/\*\*.*?\*/`, LiteralStringDoc, nil},
-		{`/\*.*?\*/`, CommentMultiline, nil},
-		{`(->|::)(\s*)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Operator, Text, NameAttribute), nil},
-		{`[~!%^&*+=|:.<>/@-]+`, Operator, nil},
-		{`\?`, Operator, nil},
-		{`[\[\]{}();,]+`, Punctuation, nil},
-		{`(class)(\s+)`, ByGroups(Keyword, Text), Push("classname")},
-		{`(function)(\s*)(?=\()`, ByGroups(Keyword, Text), nil},
-		{`(function)(\s+)(&?)(\s*)`, ByGroups(Keyword, Text, Operator, Text), Push("functionname")},
-		{`(const)(\s+)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Keyword, Text, NameConstant), nil},
-		{`(and|E_PARSE|old_function|E_ERROR|or|as|E_WARNING|parent|eval|PHP_OS|break|exit|case|extends|PHP_VERSION|cfunction|FALSE|print|for|require|continue|foreach|require_once|declare|return|default|static|do|switch|die|stdClass|echo|else|TRUE|elseif|var|empty|if|xor|enddeclare|include|virtual|endfor|include_once|while|endforeach|global|endif|list|endswitch|new|endwhile|not|array|E_ALL|NULL|final|php_user_filter|interface|implements|public|private|protected|abstract|clone|try|catch|throw|this|use|namespace|trait|yield|finally)\b`, Keyword, nil},
-		{`(true|false|null)\b`, KeywordConstant, nil},
-		Include("magicconstants"),
-		{`\$\{\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*\}`, NameVariable, nil},
-		{`\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameVariable, nil},
-		{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameOther, nil},
-		{`(\d+\.\d*|\d*\.\d+)(e[+-]?[0-9]+)?`, LiteralNumberFloat, nil},
-		{`\d+e[+-]?[0-9]+`, LiteralNumberFloat, nil},
-		{`0[0-7]+`, LiteralNumberOct, nil},
-		{`0x[a-f0-9]+`, LiteralNumberHex, nil},
-		{`[\d_]+`, LiteralNumberInteger, nil},
-		{`0b[01]+`, LiteralNumberBin, nil},
-		{`'([^'\\]*(?:\\.[^'\\]*)*)'`, LiteralStringSingle, nil},
-		{"`([^`\\\\]*(?:\\\\.[^`\\\\]*)*)`", LiteralStringBacktick, nil},
-		{`"`, LiteralStringDouble, Push("string")},
-	},
-	"magicfuncs": {
-		{Words(``, `\b`, `__construct`, `__destruct`, `__call`, `__callStatic`, `__get`, `__set`, `__isset`, `__unset`, `__sleep`, `__wakeup`, `__toString`, `__invoke`, `__set_state`, `__clone`, `__debugInfo`), NameFunctionMagic, nil},
-	},
-	"magicconstants": {
-		{Words(``, `\b`, `__LINE__`, `__FILE__`, `__DIR__`, `__FUNCTION__`, `__CLASS__`, `__TRAIT__`, `__METHOD__`, `__NAMESPACE__`), NameConstant, nil},
-	},
-	"classname": {
-		{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameClass, Pop(1)},
-	},
-	"functionname": {
-		Include("magicfuncs"),
-		{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameFunction, Pop(1)},
-		Default(Pop(1)),
-	},
-	"string": {
-		{`"`, LiteralStringDouble, Pop(1)},
-		{`[^{$"\\]+`, LiteralStringDouble, nil},
-		{`\\([nrt"$\\]|[0-7]{1,3}|x[0-9a-f]{1,2})`, LiteralStringEscape, nil},
-		{`\$(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*(\[\S+?\]|->(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)?`, LiteralStringInterpol, nil},
-		{`(\{\$\{)(.*?)(\}\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
-		{`(\{)(\$.*?)(\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
-		{`(\$\{)(\S+)(\})`, ByGroups(LiteralStringInterpol, NameVariable, LiteralStringInterpol), nil},
-		{`[${\\]`, LiteralStringDouble, nil},
-	},
+func phpRules() Rules {
+	return phpCommonRules().Rename("php", "root")
+}
+
+func phpCommonRules() Rules {
+	return Rules{
+		"php": {
+			{`\?>`, CommentPreproc, Pop(1)},
+			{`(<<<)([\'"]?)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)(\2\n.*?\n\s*)(\3)(;?)(\n)`, ByGroups(LiteralString, LiteralString, LiteralStringDelimiter, LiteralString, LiteralStringDelimiter, Punctuation, Text), nil},
+			{`\s+`, Text, nil},
+			{`#.*?\n`, CommentSingle, nil},
+			{`//.*?\n`, CommentSingle, nil},
+			{`/\*\*/`, CommentMultiline, nil},
+			{`/\*\*.*?\*/`, LiteralStringDoc, nil},
+			{`/\*.*?\*/`, CommentMultiline, nil},
+			{`(->|::)(\s*)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Operator, Text, NameAttribute), nil},
+			{`[~!%^&*+=|:.<>/@-]+`, Operator, nil},
+			{`\?`, Operator, nil},
+			{`[\[\]{}();,]+`, Punctuation, nil},
+			{`(class)(\s+)`, ByGroups(Keyword, Text), Push("classname")},
+			{`(function)(\s*)(?=\()`, ByGroups(Keyword, Text), nil},
+			{`(function)(\s+)(&?)(\s*)`, ByGroups(Keyword, Text, Operator, Text), Push("functionname")},
+			{`(const)(\s+)((?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)`, ByGroups(Keyword, Text, NameConstant), nil},
+			{`(and|E_PARSE|old_function|E_ERROR|or|as|E_WARNING|parent|eval|PHP_OS|break|exit|case|extends|PHP_VERSION|cfunction|FALSE|print|for|require|continue|foreach|require_once|declare|return|default|static|do|switch|die|stdClass|echo|else|TRUE|elseif|var|empty|if|xor|enddeclare|include|virtual|endfor|include_once|while|endforeach|global|endif|list|endswitch|new|endwhile|not|array|E_ALL|NULL|final|php_user_filter|interface|implements|public|private|protected|abstract|clone|try|catch|throw|this|use|namespace|trait|yield|finally)\b`, Keyword, nil},
+			{`(true|false|null)\b`, KeywordConstant, nil},
+			Include("magicconstants"),
+			{`\$\{\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*\}`, NameVariable, nil},
+			{`\$+(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameVariable, nil},
+			{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameOther, nil},
+			{`(\d+\.\d*|\d*\.\d+)(e[+-]?[0-9]+)?`, LiteralNumberFloat, nil},
+			{`\d+e[+-]?[0-9]+`, LiteralNumberFloat, nil},
+			{`0[0-7]+`, LiteralNumberOct, nil},
+			{`0x[a-f0-9]+`, LiteralNumberHex, nil},
+			{`[\d_]+`, LiteralNumberInteger, nil},
+			{`0b[01]+`, LiteralNumberBin, nil},
+			{`'([^'\\]*(?:\\.[^'\\]*)*)'`, LiteralStringSingle, nil},
+			{"`([^`\\\\]*(?:\\\\.[^`\\\\]*)*)`", LiteralStringBacktick, nil},
+			{`"`, LiteralStringDouble, Push("string")},
+		},
+		"magicfuncs": {
+			{Words(``, `\b`, `__construct`, `__destruct`, `__call`, `__callStatic`, `__get`, `__set`, `__isset`, `__unset`, `__sleep`, `__wakeup`, `__toString`, `__invoke`, `__set_state`, `__clone`, `__debugInfo`), NameFunctionMagic, nil},
+		},
+		"magicconstants": {
+			{Words(``, `\b`, `__LINE__`, `__FILE__`, `__DIR__`, `__FUNCTION__`, `__CLASS__`, `__TRAIT__`, `__METHOD__`, `__NAMESPACE__`), NameConstant, nil},
+		},
+		"classname": {
+			{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameClass, Pop(1)},
+		},
+		"functionname": {
+			Include("magicfuncs"),
+			{`(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*`, NameFunction, Pop(1)},
+			Default(Pop(1)),
+		},
+		"string": {
+			{`"`, LiteralStringDouble, Pop(1)},
+			{`[^{$"\\]+`, LiteralStringDouble, nil},
+			{`\\([nrt"$\\]|[0-7]{1,3}|x[0-9a-f]{1,2})`, LiteralStringEscape, nil},
+			{`\$(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*(\[\S+?\]|->(?:[\\_a-z]|[^\x00-\x7f])(?:[\\\w]|[^\x00-\x7f])*)?`, LiteralStringInterpol, nil},
+			{`(\{\$\{)(.*?)(\}\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
+			{`(\{)(\$.*?)(\})`, ByGroups(LiteralStringInterpol, UsingSelf("root"), LiteralStringInterpol), nil},
+			{`(\$\{)(\S+)(\})`, ByGroups(LiteralStringInterpol, NameVariable, LiteralStringInterpol), nil},
+			{`[${\\]`, LiteralStringDouble, nil},
+		},
+	}
 }
--- a/lexers/circular/phtml.go
+++ b/lexers/circular/phtml.go
@ -9,7 +9,7 @@ import (
 )

 // PHTML lexer is PHP in HTML.
-var PHTML = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
+var PHTML = internal.Register(DelegatingLexer(h.HTML, MustNewLazyLexer(
 	&Config{
 		Name:            "PHTML",
 		Aliases:         []string{"phtml"},
@ -19,16 +19,20 @@ var PHTML = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
 		CaseInsensitive: true,
 		EnsureNL:        true,
 	},
-	Rules{
-		"root": {
-			{`<\?(php)?`, CommentPreproc, Push("php")},
-			{`[^<]+`, Other, nil},
-			{`<`, Other, nil},
-		},
-	}.Merge(phpCommonRules),
+	phtmlRules,
 ).SetAnalyser(func(text string) float32 {
 	if strings.Contains(text, "<?php") {
 		return 0.5
 	}
 	return 0.0
 })))
+
+func phtmlRules() Rules {
+	return Rules{
+		"root": {
+			{`<\?(php)?`, CommentPreproc, Push("php")},
+			{`[^<]+`, Other, nil},
+			{`<`, Other, nil},
+		},
+	}.Merge(phpCommonRules())
+}
--- a/lexers/d/d.go
+++ b/lexers/d/d.go
@ -6,7 +6,7 @@ import (
 )

 // D lexer. https://dlang.org/spec/lex.html
-var D = internal.Register(MustNewLexer(
+var D = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "D",
 		Aliases:   []string{"d"},
@ -14,7 +14,11 @@ var D = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-d"},
 		EnsureNL:  true,
 	},
-	Rules{
+	dRules,
+))
+
+func dRules() Rules {
+	return Rules{
 		"root": {
 			{`[^\S\n]+`, Text, nil},

@ -65,5 +69,5 @@ var D = internal.Register(MustNewLexer(
 		"import": {
 			{`[\w.]+\*?`, NameNamespace, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/d/dart.go
+++ b/lexers/d/dart.go
@ -6,7 +6,7 @@ import (
 )

 // Dart lexer.
-var Dart = internal.Register(MustNewLexer(
+var Dart = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Dart",
 		Aliases:   []string{"dart"},
@ -14,7 +14,11 @@ var Dart = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-dart"},
 		DotAll:    true,
 	},
-	Rules{
+	dartRules,
+))
+
+func dartRules() Rules {
+	return Rules{
 		"root": {
 			Include("string_literal"),
 			{`#!(.*?)$`, CommentPreproc, nil},
@ -87,5 +91,5 @@ var Dart = internal.Register(MustNewLexer(
 			Include("string_common"),
 			{`(\$|\')+`, LiteralStringSingle, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/d/diff.go
+++ b/lexers/d/diff.go
@ -6,7 +6,7 @@ import (
 )

 // Diff lexer.
-var Diff = internal.Register(MustNewLexer(
+var Diff = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Diff",
 		Aliases:   []string{"diff", "udiff"},
@ -14,7 +14,11 @@ var Diff = internal.Register(MustNewLexer(
 		Filenames: []string{"*.diff", "*.patch"},
 		MimeTypes: []string{"text/x-diff", "text/x-patch"},
 	},
-	Rules{
+	diffRules,
+))
+
+func diffRules() Rules {
+	return Rules{
 		"root": {
 			{` .*\n`, Text, nil},
 			{`\+.*\n`, GenericInserted, nil},
@ -25,5 +29,5 @@ var Diff = internal.Register(MustNewLexer(
 			{`=.*\n`, GenericHeading, nil},
 			{`.*\n`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/d/django.go
+++ b/lexers/d/django.go
@ -6,7 +6,7 @@ import (
 )

 // Django/Jinja lexer.
-var DjangoJinja = internal.Register(MustNewLexer(
+var DjangoJinja = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Django/Jinja",
 		Aliases:   []string{"django", "jinja"},
@ -14,7 +14,11 @@ var DjangoJinja = internal.Register(MustNewLexer(
 		MimeTypes: []string{"application/x-django-templating", "application/x-jinja"},
 		DotAll:    true,
 	},
-	Rules{
+	djangoJinjaRules,
+))
+
+func djangoJinjaRules() Rules {
+	return Rules{
 		"root": {
 			{`[^{]+`, Other, nil},
 			{`\{\{`, CommentPreproc, Push("var")},
@ -49,5 +53,5 @@ var DjangoJinja = internal.Register(MustNewLexer(
 			Include("varnames"),
 			{`.`, Punctuation, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/d/docker.go
+++ b/lexers/d/docker.go
@ -8,7 +8,7 @@ import (
 )

 // Docker lexer.
-var Docker = internal.Register(MustNewLexer(
+var Docker = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Docker",
 		Aliases:         []string{"docker", "dockerfile"},
@ -16,7 +16,11 @@ var Docker = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-dockerfile-config"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	dockerRules,
+))
+
+func dockerRules() Rules {
+	return Rules{
 		"root": {
 			{`#.*`, Comment, nil},
 			{`(ONBUILD)((?:\s*\\?\s*))`, ByGroups(Keyword, Using(b.Bash)), nil},
@ -27,5 +31,5 @@ var Docker = internal.Register(MustNewLexer(
 			{`((?:RUN|CMD|ENTRYPOINT|ENV|ARG|LABEL|ADD|COPY))`, Keyword, nil},
 			{`(.*\\\n)*.+`, Using(b.Bash), nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/d/dtd.go
+++ b/lexers/d/dtd.go
@ -6,7 +6,7 @@ import (
 )

 // Dtd lexer.
-var Dtd = internal.Register(MustNewLexer(
+var Dtd = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "DTD",
 		Aliases:   []string{"dtd"},
@ -14,7 +14,11 @@ var Dtd = internal.Register(MustNewLexer(
 		MimeTypes: []string{"application/xml-dtd"},
 		DotAll:    true,
 	},
-	Rules{
+	dtdRules,
+))
+
+func dtdRules() Rules {
+	return Rules{
 		"root": {
 			Include("common"),
 			{`(<!ELEMENT)(\s+)(\S+)`, ByGroups(Keyword, Text, NameTag), Push("element")},
@ -65,5 +69,5 @@ var Dtd = internal.Register(MustNewLexer(
 			{`[^>\s|()?+*,]+`, NameAttribute, nil},
 			{`>`, Keyword, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/e/ebnf.go
+++ b/lexers/e/ebnf.go
@ -6,14 +6,18 @@ import (
 )

 // Ebnf lexer.
-var Ebnf = internal.Register(MustNewLexer(
+var Ebnf = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "EBNF",
 		Aliases:   []string{"ebnf"},
 		Filenames: []string{"*.ebnf"},
 		MimeTypes: []string{"text/x-ebnf"},
 	},
-	Rules{
+	ebnfRules,
+))
+
+func ebnfRules() Rules {
+	return Rules{
 		"root": {
 			Include("whitespace"),
 			Include("comment_start"),
@ -47,5 +51,5 @@ var Ebnf = internal.Register(MustNewLexer(
 		"identifier": {
 			{`([a-zA-Z][\w \-]*)`, Keyword, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/e/elixir.go
+++ b/lexers/e/elixir.go
@ -6,14 +6,18 @@ import (
 )

 // Elixir lexer.
-var Elixir = internal.Register(MustNewLexer(
+var Elixir = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Elixir",
 		Aliases:   []string{"elixir", "ex", "exs"},
 		Filenames: []string{"*.ex", "*.exs"},
 		MimeTypes: []string{"text/x-elixir"},
 	},
-	Rules{
+	elixirRules,
+))
+
+func elixirRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`#.*$`, CommentSingle, nil},
@ -273,5 +277,5 @@ var Elixir = internal.Register(MustNewLexer(
 			{`\\.`, LiteralStringOther, nil},
 			{`'[a-zA-Z]*`, LiteralStringOther, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/e/elm.go
+++ b/lexers/e/elm.go
@ -6,14 +6,18 @@ import (
 )

 // Elm lexer.
-var Elm = internal.Register(MustNewLexer(
+var Elm = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Elm",
 		Aliases:   []string{"elm"},
 		Filenames: []string{"*.elm"},
 		MimeTypes: []string{"text/x-elm"},
 	},
-	Rules{
+	elmRules,
+))
+
+func elmRules() Rules {
+	return Rules{
 		"root": {
 			{`\{-`, CommentMultiline, Push("comment")},
 			{`--.*`, CommentSingle, nil},
@ -55,5 +59,5 @@ var Elm = internal.Register(MustNewLexer(
 			{`\|\]`, NameEntity, Pop(1)},
 			{`.*\n`, NameEntity, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/e/emacs.go
+++ b/lexers/e/emacs.go
@ -522,14 +522,24 @@ var (
 )

 // EmacsLisp lexer.
-var EmacsLisp = internal.Register(TypeRemappingLexer(MustNewLexer(
+var EmacsLisp = internal.Register(TypeRemappingLexer(MustNewLazyLexer(
 	&Config{
 		Name:      "EmacsLisp",
 		Aliases:   []string{"emacs", "elisp", "emacs-lisp"},
 		Filenames: []string{"*.el"},
 		MimeTypes: []string{"text/x-elisp", "application/x-elisp"},
 	},
-	Rules{
+	emacsLispRules,
+), TypeMapping{
+	{NameVariable, NameFunction, emacsBuiltinFunction},
+	{NameVariable, NameBuiltin, emacsSpecialForms},
+	{NameVariable, NameException, emacsErrorKeywords},
+	{NameVariable, NameBuiltin, append(emacsBuiltinFunctionHighlighted, emacsMacros...)},
+	{NameVariable, KeywordPseudo, emacsLambdaListKeywords},
+}))
+
+func emacsLispRules() Rules {
+	return Rules{
 		"root": {
 			Default(Push("body")),
 		},
@ -572,11 +582,5 @@ var EmacsLisp = internal.Register(TypeRemappingLexer(MustNewLexer(
 			{`\\\n`, LiteralString, nil},
 			{`"`, LiteralString, Pop(1)},
 		},
-	},
-), TypeMapping{
-	{NameVariable, NameFunction, emacsBuiltinFunction},
-	{NameVariable, NameBuiltin, emacsSpecialForms},
-	{NameVariable, NameException, emacsErrorKeywords},
-	{NameVariable, NameBuiltin, append(emacsBuiltinFunctionHighlighted, emacsMacros...)},
-	{NameVariable, KeywordPseudo, emacsLambdaListKeywords},
-}))
+	}
+}
--- a/lexers/e/erlang.go
+++ b/lexers/e/erlang.go
@ -6,14 +6,18 @@ import (
 )

 // Erlang lexer.
-var Erlang = internal.Register(MustNewLexer(
+var Erlang = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Erlang",
 		Aliases:   []string{"erlang"},
 		Filenames: []string{"*.erl", "*.hrl", "*.es", "*.escript"},
 		MimeTypes: []string{"text/x-erlang"},
 	},
-	Rules{
+	erlangRules,
+))
+
+func erlangRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`%.*\n`, Comment, nil},
@ -62,5 +66,5 @@ var Erlang = internal.Register(MustNewLexer(
 			{`,`, Punctuation, Pop(1)},
 			{`(?=\})`, Punctuation, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/f/factor.go
+++ b/lexers/f/factor.go
@ -6,14 +6,18 @@ import (
 )

 // Factor lexer.
-var Factor = internal.Register(MustNewLexer(
+var Factor = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Factor",
 		Aliases:   []string{"factor"},
 		Filenames: []string{"*.factor"},
 		MimeTypes: []string{"text/x-factor"},
 	},
-	Rules{
+	factorRules,
+))
+
+func factorRules() Rules {
+	return Rules{
 		"root": {
 			{`#!.*$`, CommentPreproc, nil},
 			Default(Push("base")),
@ -111,5 +115,5 @@ var Factor = internal.Register(MustNewLexer(
 			{`;\s`, Keyword, Pop(1)},
 			{`\S+`, NameFunction, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/f/fish.go
+++ b/lexers/f/fish.go
@ -6,14 +6,18 @@ import (
 )

 // Fish lexer.
-var Fish = internal.Register(MustNewLexer(
+var Fish = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Fish",
 		Aliases:   []string{"fish", "fishshell"},
 		Filenames: []string{"*.fish", "*.load"},
 		MimeTypes: []string{"application/x-fish"},
 	},
-	Rules{
+	fishRules,
+))
+
+func fishRules() Rules {
+	return Rules{
 		"root": {
 			Include("basic"),
 			Include("data"),
@ -61,5 +65,5 @@ var Fish = internal.Register(MustNewLexer(
 			{`\d+`, LiteralNumber, nil},
 			Include("root"),
 		},
-	},
-))
+	}
+}
--- a/lexers/f/forth.go
+++ b/lexers/f/forth.go
@ -6,7 +6,7 @@ import (
 )

 // Forth lexer.
-var Forth = internal.Register(MustNewLexer(
+var Forth = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Forth",
 		Aliases:         []string{"forth"},
@ -14,7 +14,11 @@ var Forth = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"application/x-forth"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	forthRules,
+))
+
+func forthRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`\\.*?\n`, CommentSingle, nil},
@ -36,5 +40,5 @@ var Forth = internal.Register(MustNewLexer(
 		"stringdef": {
 			{`[^"]+`, LiteralString, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/f/fortran.go
+++ b/lexers/f/fortran.go
@ -6,7 +6,7 @@ import (
 )

 // Fortran lexer.
-var Fortran = internal.Register(MustNewLexer(
+var Fortran = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Fortran",
 		Aliases:         []string{"fortran"},
@ -14,7 +14,11 @@ var Fortran = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-fortran"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	fortranRules,
+))
+
+func fortranRules() Rules {
+	return Rules{
 		"root": {
 			{`^#.*\n`, CommentPreproc, nil},
 			{`!.*\n`, Comment, nil},
@ -43,5 +47,5 @@ var Fortran = internal.Register(MustNewLexer(
 			{`[+-]?\d*\.\d+([ed][-+]?\d+)?(_[a-z]\w+)?`, LiteralNumberFloat, nil},
 			{`[+-]?\d+\.\d*([ed][-+]?\d+)?(_[a-z]\w+)?`, LiteralNumberFloat, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/f/fsharp.go
+++ b/lexers/f/fsharp.go
@ -6,14 +6,18 @@ import (
 )

 // Fsharp lexer.
-var Fsharp = internal.Register(MustNewLexer(
+var Fsharp = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "FSharp",
 		Aliases:   []string{"fsharp"},
 		Filenames: []string{"*.fs", "*.fsi"},
 		MimeTypes: []string{"text/x-fsharp"},
 	},
-	Rules{
+	fsharpRules,
+))
+
+func fsharpRules() Rules {
+	return Rules{
 		"escape-sequence": {
 			{`\\[\\"\'ntbrafv]`, LiteralStringEscape, nil},
 			{`\\[0-9]{3}`, LiteralStringEscape, nil},
@ -90,5 +94,5 @@ var Fsharp = internal.Register(MustNewLexer(
 			{`"""B?`, LiteralString, Pop(1)},
 			{`"`, LiteralString, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/g/gas.go
+++ b/lexers/g/gas.go
@ -6,14 +6,18 @@ import (
 )

 // Gas lexer.
-var Gas = internal.Register(MustNewLexer(
+var Gas = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "GAS",
 		Aliases:   []string{"gas", "asm"},
 		Filenames: []string{"*.s", "*.S"},
 		MimeTypes: []string{"text/x-gas"},
 	},
-	Rules{
+	gasRules,
+))
+
+func gasRules() Rules {
+	return Rules{
 		"root": {
 			Include("whitespace"),
 			{`(?:[a-zA-Z$_][\w$.@-]*|\.[\w$.@-]+):`, NameLabel, nil},
@ -51,5 +55,5 @@ var Gas = internal.Register(MustNewLexer(
 		"punctuation": {
 			{`[-*,.()\[\]!:]+`, Punctuation, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/g/gdscript.go
+++ b/lexers/g/gdscript.go
@ -6,14 +6,18 @@ import (
 )

 // GDScript lexer.
-var GDScript = internal.Register(MustNewLexer(
+var GDScript = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "GDScript",
 		Aliases:   []string{"gdscript", "gd"},
 		Filenames: []string{"*.gd"},
 		MimeTypes: []string{"text/x-gdscript", "application/x-gdscript"},
 	},
-	Rules{
+	gdscriptRules,
+))
+
+func gdscriptRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			{`^(\s*)([rRuUbB]{,2})("""(?:.|\n)*?""")`, ByGroups(Text, LiteralStringAffix, LiteralStringDoc), nil},
@ -120,5 +124,5 @@ var GDScript = internal.Register(MustNewLexer(
 			Include("strings-single"),
 			{`\n`, LiteralStringSingle, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/g/genshi.go
+++ b/lexers/g/genshi.go
@ -7,14 +7,18 @@ import (
 )

 // Genshi Text lexer.
-var GenshiText = internal.Register(MustNewLexer(
+var GenshiText = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Genshi Text",
 		Aliases:   []string{"genshitext"},
 		Filenames: []string{},
 		MimeTypes: []string{"application/x-genshi-text", "text/x-genshi"},
 	},
-	Rules{
+	genshiTextRules,
+))
+
+func genshiTextRules() Rules {
+	return Rules{
 		"root": {
 			{`[^#$\s]+`, Other, nil},
 			{`^(\s*)(##.*)$`, ByGroups(Text, Comment), nil},
@ -33,11 +37,11 @@ var GenshiText = internal.Register(MustNewLexer(
 			{`(?<!\$)(\$\{)(.+?)(\})`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
 			{`(?<!\$)(\$)([a-zA-Z_][\w.]*)`, NameVariable, nil},
 		},
-	},
-))
+	}
+}

 // Html+Genshi lexer.
-var GenshiHTMLTemplate = internal.Register(MustNewLexer(
+var GenshiHTMLTemplate = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:         "Genshi HTML",
 		Aliases:      []string{"html+genshi", "html+kid"},
@ -50,7 +54,7 @@ var GenshiHTMLTemplate = internal.Register(MustNewLexer(
 ))

 // Genshi lexer.
-var Genshi = internal.Register(MustNewLexer(
+var Genshi = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:         "Genshi",
 		Aliases:      []string{"genshi", "kid", "xml+genshi", "xml+kid"},
@ -62,53 +66,55 @@ var Genshi = internal.Register(MustNewLexer(
 	genshiMarkupRules,
 ))

-var genshiMarkupRules = Rules{
-	"root": {
-		{`[^<$]+`, Other, nil},
-		{`(<\?python)(.*?)(\?>)`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
-		{`<\s*(script|style)\s*.*?>.*?<\s*/\1\s*>`, Other, nil},
-		{`<\s*py:[a-zA-Z0-9]+`, NameTag, Push("pytag")},
-		{`<\s*[a-zA-Z0-9:.]+`, NameTag, Push("tag")},
-		Include("variable"),
-		{`[<$]`, Other, nil},
-	},
-	"pytag": {
-		{`\s+`, Text, nil},
-		{`[\w:-]+\s*=`, NameAttribute, Push("pyattr")},
-		{`/?\s*>`, NameTag, Pop(1)},
-	},
-	"pyattr": {
-		{`(")(.*?)(")`, ByGroups(LiteralString, Using(Python), LiteralString), Pop(1)},
-		{`(')(.*?)(')`, ByGroups(LiteralString, Using(Python), LiteralString), Pop(1)},
-		{`[^\s>]+`, LiteralString, Pop(1)},
-	},
-	"tag": {
-		{`\s+`, Text, nil},
-		{`py:[\w-]+\s*=`, NameAttribute, Push("pyattr")},
-		{`[\w:-]+\s*=`, NameAttribute, Push("attr")},
-		{`/?\s*>`, NameTag, Pop(1)},
-	},
-	"attr": {
-		{`"`, LiteralString, Push("attr-dstring")},
-		{`'`, LiteralString, Push("attr-sstring")},
-		{`[^\s>]*`, LiteralString, Pop(1)},
-	},
-	"attr-dstring": {
-		{`"`, LiteralString, Pop(1)},
-		Include("strings"),
-		{`'`, LiteralString, nil},
-	},
-	"attr-sstring": {
-		{`'`, LiteralString, Pop(1)},
-		Include("strings"),
-		{`'`, LiteralString, nil},
-	},
-	"strings": {
-		{`[^"'$]+`, LiteralString, nil},
-		Include("variable"),
-	},
-	"variable": {
-		{`(?<!\$)(\$\{)(.+?)(\})`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
-		{`(?<!\$)(\$)([a-zA-Z_][\w\.]*)`, NameVariable, nil},
-	},
+func genshiMarkupRules() Rules {
+	return Rules{
+		"root": {
+			{`[^<$]+`, Other, nil},
+			{`(<\?python)(.*?)(\?>)`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
+			{`<\s*(script|style)\s*.*?>.*?<\s*/\1\s*>`, Other, nil},
+			{`<\s*py:[a-zA-Z0-9]+`, NameTag, Push("pytag")},
+			{`<\s*[a-zA-Z0-9:.]+`, NameTag, Push("tag")},
+			Include("variable"),
+			{`[<$]`, Other, nil},
+		},
+		"pytag": {
+			{`\s+`, Text, nil},
+			{`[\w:-]+\s*=`, NameAttribute, Push("pyattr")},
+			{`/?\s*>`, NameTag, Pop(1)},
+		},
+		"pyattr": {
+			{`(")(.*?)(")`, ByGroups(LiteralString, Using(Python), LiteralString), Pop(1)},
+			{`(')(.*?)(')`, ByGroups(LiteralString, Using(Python), LiteralString), Pop(1)},
+			{`[^\s>]+`, LiteralString, Pop(1)},
+		},
+		"tag": {
+			{`\s+`, Text, nil},
+			{`py:[\w-]+\s*=`, NameAttribute, Push("pyattr")},
+			{`[\w:-]+\s*=`, NameAttribute, Push("attr")},
+			{`/?\s*>`, NameTag, Pop(1)},
+		},
+		"attr": {
+			{`"`, LiteralString, Push("attr-dstring")},
+			{`'`, LiteralString, Push("attr-sstring")},
+			{`[^\s>]*`, LiteralString, Pop(1)},
+		},
+		"attr-dstring": {
+			{`"`, LiteralString, Pop(1)},
+			Include("strings"),
+			{`'`, LiteralString, nil},
+		},
+		"attr-sstring": {
+			{`'`, LiteralString, Pop(1)},
+			Include("strings"),
+			{`'`, LiteralString, nil},
+		},
+		"strings": {
+			{`[^"'$]+`, LiteralString, nil},
+			Include("variable"),
+		},
+		"variable": {
+			{`(?<!\$)(\$\{)(.+?)(\})`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
+			{`(?<!\$)(\$)([a-zA-Z_][\w\.]*)`, NameVariable, nil},
+		},
+	}
 }
--- a/lexers/g/gherkin.go
+++ b/lexers/g/gherkin.go
@ -5,23 +5,27 @@ import (
 	"github.com/alecthomas/chroma/lexers/internal"
 )

-var stepKeywords = `^(\s*)(하지만|조건|먼저|만일|만약|단|그리고|그러면|那麼|那么|而且|當|当|前提|假設|假设|假如|假定|但是|但し|並且|并且|同時|同时|もし|ならば|ただし|しかし|かつ|و |متى |لكن |عندما |ثم |بفرض |اذاً |כאשר |וגם |בהינתן |אזי |אז |אבל |Якщо |Унда |То |Припустимо, що |Припустимо |Онда |Но |Нехай |Лекин |Когато |Када |Кад |К тому же |И |Задато |Задати |Задате |Если |Допустим |Дадено |Ва |Бирок |Аммо |Али |Але |Агар |А |І |Și |És |Zatati |Zakładając |Zadato |Zadate |Zadano |Zadani |Zadan |Youse know when youse got |Youse know like when |Yna |Ya know how |Ya gotta |Y |Wun |Wtedy |When y'all |When |Wenn |WEN |Và |Ve |Und |Un |Thì |Then y'all |Then |Tapi |Tak |Tada |Tad |Så |Stel |Soit |Siis |Si |Sed |Se |Quando |Quand |Quan |Pryd |Pokud |Pokiaľ |Però |Pero |Pak |Oraz |Onda |Ond |Oletetaan |Og |Och |O zaman |Når |När |Niin |Nhưng |N |Mutta |Men |Mas |Maka |Majd |Mais |Maar |Ma |Lorsque |Lorsqu'|Kun |Kuid |Kui |Khi |Keď |Ketika |Když |Kaj |Kai |Kada |Kad |Jeżeli |Ja |Ir |I CAN HAZ |I |Ha |Givun |Givet |Given y'all |Given |Gitt |Gegeven |Gegeben sei |Fakat |Eğer ki |Etant donné |Et |Então |Entonces |Entao |En |Eeldades |E |Duota |Dun |Donitaĵo |Donat |Donada |Do |Diyelim ki |Dengan |Den youse gotta |De |Dato |Dar |Dann |Dan |Dado |Dacă |Daca |DEN |Când |Cuando |Cho |Cept |Cand |Cal |But y'all |But |Buh |Biết |Bet |BUT |Atès |Atunci |Atesa |Anrhegedig a |Angenommen |And y'all |And |An |Ama |Als |Alors |Allora |Ali |Aleshores |Ale |Akkor |Aber |AN |A také |A |\* )`
-
-var featureKeywords = `^(기능|機能|功能|フィーチャ|خاصية|תכונה|Функціонал|Функционалност|Функционал|Фича|Особина|Могућност|Özellik|Właściwość|Tính năng|Trajto|Savybė|Požiadavka|Požadavek|Osobina|Ominaisuus|Omadus|OH HAI|Mogućnost|Mogucnost|Jellemző|Fīča|Funzionalità|Funktionalität|Funkcionalnost|Funkcionalitāte|Funcționalitate|Functionaliteit|Functionalitate|Funcionalitat|Funcionalidade|Fonctionnalité|Fitur|Feature|Egenskap|Egenskab|Crikey|Característica|Arwedd)(:)(.*)$`
-
-var featureElementKeywords = `^(\s*)(시나리오 개요|시나리오|배경|背景|場景大綱|場景|场景大纲|场景|劇本大綱|劇本|剧本大纲|剧本|テンプレ|シナリオテンプレート|シナリオテンプレ|シナリオアウトライン|シナリオ|سيناريو مخطط|سيناريو|الخلفية|תרחיש|תבנית תרחיש|רקע|Тарих|Сценарій|Сценарио|Сценарий структураси|Сценарий|Структура сценарію|Структура сценарија|Структура сценария|Скица|Рамка на сценарий|Пример|Предыстория|Предистория|Позадина|Передумова|Основа|Концепт|Контекст|Założenia|Wharrimean is|Tình huống|The thing of it is|Tausta|Taust|Tapausaihio|Tapaus|Szenariogrundriss|Szenario|Szablon scenariusza|Stsenaarium|Struktura scenarija|Skica|Skenario konsep|Skenario|Situācija|Senaryo taslağı|Senaryo|Scénář|Scénario|Schema dello scenario|Scenārijs pēc parauga|Scenārijs|Scenár|Scenaro|Scenariusz|Scenariul de şablon|Scenariul de sablon|Scenariu|Scenario Outline|Scenario Amlinellol|Scenario|Scenarijus|Scenarijaus šablonas|Scenarij|Scenarie|Rerefons|Raamstsenaarium|Primer|Pozadí|Pozadina|Pozadie|Plan du scénario|Plan du Scénario|Osnova scénáře|Osnova|Náčrt Scénáře|Náčrt Scenáru|Mate|MISHUN SRSLY|MISHUN|Kịch bản|Konturo de la scenaro|Kontext|Konteksts|Kontekstas|Kontekst|Koncept|Khung tình huống|Khung kịch bản|Háttér|Grundlage|Geçmiş|Forgatókönyv vázlat|Forgatókönyv|Fono|Esquema do Cenário|Esquema do Cenario|Esquema del escenario|Esquema de l'escenari|Escenario|Escenari|Dis is what went down|Dasar|Contexto|Contexte|Contesto|Condiţii|Conditii|Cenário|Cenario|Cefndir|Bối cảnh|Blokes|Bakgrunn|Bakgrund|Baggrund|Background|B4|Antecedents|Antecedentes|All y'all|Achtergrond|Abstrakt Scenario|Abstract Scenario)(:)(.*)$`
-
-var examplesKeywords = `^(\s*)(예|例子|例|サンプル|امثلة|דוגמאות|Сценарији|Примери|Приклади|Мисоллар|Значения|Örnekler|Voorbeelden|Variantai|Tapaukset|Scenarios|Scenariji|Scenarijai|Příklady|Példák|Príklady|Przykłady|Primjeri|Primeri|Piemēri|Pavyzdžiai|Paraugs|Juhtumid|Exemplos|Exemples|Exemplele|Exempel|Examples|Esempi|Enghreifftiau|Ekzemploj|Eksempler|Ejemplos|EXAMPLZ|Dữ liệu|Contoh|Cobber|Beispiele)(:)(.*)$`
-
 // Gherkin lexer.
-var Gherkin = internal.Register(MustNewLexer(
+var Gherkin = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Gherkin",
 		Aliases:   []string{"cucumber", "Cucumber", "gherkin", "Gherkin"},
 		Filenames: []string{"*.feature", "*.FEATURE"},
 		MimeTypes: []string{"text/x-gherkin"},
 	},
-	Rules{
+	gherkinRules,
+))
+
+func gherkinRules() Rules {
+	stepKeywords := `^(\s*)(하지만|조건|먼저|만일|만약|단|그리고|그러면|那麼|那么|而且|當|当|前提|假設|假设|假如|假定|但是|但し|並且|并且|同時|同时|もし|ならば|ただし|しかし|かつ|و |متى |لكن |عندما |ثم |بفرض |اذاً |כאשר |וגם |בהינתן |אזי |אז |אבל |Якщо |Унда |То |Припустимо, що |Припустимо |Онда |Но |Нехай |Лекин |Когато |Када |Кад |К тому же |И |Задато |Задати |Задате |Если |Допустим |Дадено |Ва |Бирок |Аммо |Али |Але |Агар |А |І |Și |És |Zatati |Zakładając |Zadato |Zadate |Zadano |Zadani |Zadan |Youse know when youse got |Youse know like when |Yna |Ya know how |Ya gotta |Y |Wun |Wtedy |When y'all |When |Wenn |WEN |Và |Ve |Und |Un |Thì |Then y'all |Then |Tapi |Tak |Tada |Tad |Så |Stel |Soit |Siis |Si |Sed |Se |Quando |Quand |Quan |Pryd |Pokud |Pokiaľ |Però |Pero |Pak |Oraz |Onda |Ond |Oletetaan |Og |Och |O zaman |Når |När |Niin |Nhưng |N |Mutta |Men |Mas |Maka |Majd |Mais |Maar |Ma |Lorsque |Lorsqu'|Kun |Kuid |Kui |Khi |Keď |Ketika |Když |Kaj |Kai |Kada |Kad |Jeżeli |Ja |Ir |I CAN HAZ |I |Ha |Givun |Givet |Given y'all |Given |Gitt |Gegeven |Gegeben sei |Fakat |Eğer ki |Etant donné |Et |Então |Entonces |Entao |En |Eeldades |E |Duota |Dun |Donitaĵo |Donat |Donada |Do |Diyelim ki |Dengan |Den youse gotta |De |Dato |Dar |Dann |Dan |Dado |Dacă |Daca |DEN |Când |Cuando |Cho |Cept |Cand |Cal |But y'all |But |Buh |Biết |Bet |BUT |Atès |Atunci |Atesa |Anrhegedig a |Angenommen |And y'all |And |An |Ama |Als |Alors |Allora |Ali |Aleshores |Ale |Akkor |Aber |AN |A také |A |\* )`
+
+	featureKeywords := `^(기능|機能|功能|フィーチャ|خاصية|תכונה|Функціонал|Функционалност|Функционал|Фича|Особина|Могућност|Özellik|Właściwość|Tính năng|Trajto|Savybė|Požiadavka|Požadavek|Osobina|Ominaisuus|Omadus|OH HAI|Mogućnost|Mogucnost|Jellemző|Fīča|Funzionalità|Funktionalität|Funkcionalnost|Funkcionalitāte|Funcționalitate|Functionaliteit|Functionalitate|Funcionalitat|Funcionalidade|Fonctionnalité|Fitur|Feature|Egenskap|Egenskab|Crikey|Característica|Arwedd)(:)(.*)$`
+
+	featureElementKeywords := `^(\s*)(시나리오 개요|시나리오|배경|背景|場景大綱|場景|场景大纲|场景|劇本大綱|劇本|剧本大纲|剧本|テンプレ|シナリオテンプレート|シナリオテンプレ|シナリオアウトライン|シナリオ|سيناريو مخطط|سيناريو|الخلفية|תרחיש|תבנית תרחיש|רקע|Тарих|Сценарій|Сценарио|Сценарий структураси|Сценарий|Структура сценарію|Структура сценарија|Структура сценария|Скица|Рамка на сценарий|Пример|Предыстория|Предистория|Позадина|Передумова|Основа|Концепт|Контекст|Założenia|Wharrimean is|Tình huống|The thing of it is|Tausta|Taust|Tapausaihio|Tapaus|Szenariogrundriss|Szenario|Szablon scenariusza|Stsenaarium|Struktura scenarija|Skica|Skenario konsep|Skenario|Situācija|Senaryo taslağı|Senaryo|Scénář|Scénario|Schema dello scenario|Scenārijs pēc parauga|Scenārijs|Scenár|Scenaro|Scenariusz|Scenariul de şablon|Scenariul de sablon|Scenariu|Scenario Outline|Scenario Amlinellol|Scenario|Scenarijus|Scenarijaus šablonas|Scenarij|Scenarie|Rerefons|Raamstsenaarium|Primer|Pozadí|Pozadina|Pozadie|Plan du scénario|Plan du Scénario|Osnova scénáře|Osnova|Náčrt Scénáře|Náčrt Scenáru|Mate|MISHUN SRSLY|MISHUN|Kịch bản|Konturo de la scenaro|Kontext|Konteksts|Kontekstas|Kontekst|Koncept|Khung tình huống|Khung kịch bản|Háttér|Grundlage|Geçmiş|Forgatókönyv vázlat|Forgatókönyv|Fono|Esquema do Cenário|Esquema do Cenario|Esquema del escenario|Esquema de l'escenari|Escenario|Escenari|Dis is what went down|Dasar|Contexto|Contexte|Contesto|Condiţii|Conditii|Cenário|Cenario|Cefndir|Bối cảnh|Blokes|Bakgrunn|Bakgrund|Baggrund|Background|B4|Antecedents|Antecedentes|All y'all|Achtergrond|Abstrakt Scenario|Abstract Scenario)(:)(.*)$`
+
+	examplesKeywords := `^(\s*)(예|例子|例|サンプル|امثلة|דוגמאות|Сценарији|Примери|Приклади|Мисоллар|Значения|Örnekler|Voorbeelden|Variantai|Tapaukset|Scenarios|Scenariji|Scenarijai|Příklady|Példák|Príklady|Przykłady|Primjeri|Primeri|Piemēri|Pavyzdžiai|Paraugs|Juhtumid|Exemplos|Exemples|Exemplele|Exempel|Examples|Esempi|Enghreifftiau|Ekzemploj|Eksempler|Ejemplos|EXAMPLZ|Dữ liệu|Contoh|Cobber|Beispiele)(:)(.*)$`
+
+	return Rules{
 		"comments": {
 			{`\s*#.*$`, Comment, nil},
 		},
@ -114,5 +118,5 @@ var Gherkin = internal.Register(MustNewLexer(
 			{examplesKeywords, ByGroups(NameFunction, Keyword, Keyword, NameFunction), Push("examplesTable")},
 			{`(\s|.)`, NameFunction, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/g/glsl.go
+++ b/lexers/g/glsl.go
@ -6,14 +6,18 @@ import (
 )

 // GLSL lexer.
-var GLSL = internal.Register(MustNewLexer(
+var GLSL = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "GLSL",
 		Aliases:   []string{"glsl"},
 		Filenames: []string{"*.vert", "*.frag", "*.geo"},
 		MimeTypes: []string{"text/x-glslsrc"},
 	},
-	Rules{
+	glslRules,
+))
+
+func glslRules() Rules {
+	return Rules{
 		"root": {
 			{`^#.*`, CommentPreproc, nil},
 			{`//.*`, CommentSingle, nil},
@ -33,5 +37,5 @@ var GLSL = internal.Register(MustNewLexer(
 			{`\.`, Punctuation, nil},
 			{`\s+`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/g/gnuplot.go
+++ b/lexers/g/gnuplot.go
@ -6,14 +6,18 @@ import (
 )

 // Gnuplot lexer.
-var Gnuplot = internal.Register(MustNewLexer(
+var Gnuplot = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Gnuplot",
 		Aliases:   []string{"gnuplot"},
 		Filenames: []string{"*.plot", "*.plt"},
 		MimeTypes: []string{"text/x-gnuplot"},
 	},
-	Rules{
+	gnuplotRules,
+))
+
+func gnuplotRules() Rules {
+	return Rules{
 		"root": {
 			Include("whitespace"),
 			{`bind\b|bin\b|bi\b`, Keyword, Push("bind")},
@ -113,5 +117,5 @@ var Gnuplot = internal.Register(MustNewLexer(
 			{`functions\b|function\b|functio\b|functi\b|funct\b|func\b|fun\b|fu\b|f\b|set\b|se\b|s\b|terminal\b|termina\b|termin\b|termi\b|term\b|ter\b|te\b|t\b|variables\b|variable\b|variabl\b|variab\b|varia\b|vari\b|var\b|va\b|v\b`, NameBuiltin, nil},
 			Include("genericargs"),
 		},
-	},
-))
+	}
+}
--- a/lexers/g/go.go
+++ b/lexers/g/go.go
@ -9,7 +9,7 @@ import (
 )

 // Go lexer.
-var Go = internal.Register(MustNewLexer(
+var Go = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Go",
 		Aliases:   []string{"go", "golang"},
@ -17,7 +17,19 @@ var Go = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-gosrc"},
 		EnsureNL:  true,
 	},
-	Rules{
+	goRules,
+).SetAnalyser(func(text string) float32 {
+	if strings.Contains(text, "fmt.") && strings.Contains(text, "package ") {
+		return 0.5
+	}
+	if strings.Contains(text, "package ") {
+		return 0.1
+	}
+	return 0.0
+}))
+
+func goRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			{`\s+`, Text, nil},
@ -47,58 +59,52 @@ var Go = internal.Register(MustNewLexer(
 			{`[|^<>=!()\[\]{}.,;:]`, Punctuation, nil},
 			{`[^\W\d]\w*`, NameOther, nil},
 		},
-	},
-).SetAnalyser(func(text string) float32 {
-	if strings.Contains(text, "fmt.") && strings.Contains(text, "package ") {
-		return 0.5
 	}
-	if strings.Contains(text, "package ") {
-		return 0.1
-	}
-	return 0.0
-}))
-
-var goTemplateRules = Rules{
-	"root": {
-		{`{{(- )?/\*(.|\n)*?\*/( -)?}}`, CommentMultiline, nil},
-		{`{{[-]?`, CommentPreproc, Push("template")},
-		{`[^{]+`, Other, nil},
-		{`{`, Other, nil},
-	},
-	"template": {
-		{`[-]?}}`, CommentPreproc, Pop(1)},
-		{`(?=}})`, CommentPreproc, Pop(1)}, // Terminate the pipeline
-		{`\(`, Operator, Push("subexpression")},
-		{`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
-		Include("expression"),
-	},
-	"subexpression": {
-		{`\)`, Operator, Pop(1)},
-		Include("expression"),
-	},
-	"expression": {
-		{`\s+`, Whitespace, nil},
-		{`\(`, Operator, Push("subexpression")},
-		{`(range|if|else|while|with|template|end|true|false|nil|and|call|html|index|js|len|not|or|print|printf|println|urlquery|eq|ne|lt|le|gt|ge)\b`, Keyword, nil},
-		{`\||:?=|,`, Operator, nil},
-		{`[$]?[^\W\d]\w*`, NameOther, nil},
-		{`[$]?\.(?:[^\W\d]\w*)?`, NameAttribute, nil},
-		{`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
-		{`-?\d+i`, LiteralNumber, nil},
-		{`-?\d+\.\d*([Ee][-+]\d+)?i`, LiteralNumber, nil},
-		{`\.\d+([Ee][-+]\d+)?i`, LiteralNumber, nil},
-		{`-?\d+[Ee][-+]\d+i`, LiteralNumber, nil},
-		{`-?\d+(\.\d+[eE][+\-]?\d+|\.\d*|[eE][+\-]?\d+)`, LiteralNumberFloat, nil},
-		{`-?\.\d+([eE][+\-]?\d+)?`, LiteralNumberFloat, nil},
-		{`-?0[0-7]+`, LiteralNumberOct, nil},
-		{`-?0[xX][0-9a-fA-F]+`, LiteralNumberHex, nil},
-		{`-?(0|[1-9][0-9]*)`, LiteralNumberInteger, nil},
-		{`'(\\['"\\abfnrtv]|\\x[0-9a-fA-F]{2}|\\[0-7]{1,3}|\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}|[^\\])'`, LiteralStringChar, nil},
-		{"`[^`]*`", LiteralString, nil},
-	},
 }

-var GoHTMLTemplate = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
+func goTemplateRules() Rules {
+	return Rules{
+		"root": {
+			{`{{(- )?/\*(.|\n)*?\*/( -)?}}`, CommentMultiline, nil},
+			{`{{[-]?`, CommentPreproc, Push("template")},
+			{`[^{]+`, Other, nil},
+			{`{`, Other, nil},
+		},
+		"template": {
+			{`[-]?}}`, CommentPreproc, Pop(1)},
+			{`(?=}})`, CommentPreproc, Pop(1)}, // Terminate the pipeline
+			{`\(`, Operator, Push("subexpression")},
+			{`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
+			Include("expression"),
+		},
+		"subexpression": {
+			{`\)`, Operator, Pop(1)},
+			Include("expression"),
+		},
+		"expression": {
+			{`\s+`, Whitespace, nil},
+			{`\(`, Operator, Push("subexpression")},
+			{`(range|if|else|while|with|template|end|true|false|nil|and|call|html|index|js|len|not|or|print|printf|println|urlquery|eq|ne|lt|le|gt|ge)\b`, Keyword, nil},
+			{`\||:?=|,`, Operator, nil},
+			{`[$]?[^\W\d]\w*`, NameOther, nil},
+			{`[$]?\.(?:[^\W\d]\w*)?`, NameAttribute, nil},
+			{`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
+			{`-?\d+i`, LiteralNumber, nil},
+			{`-?\d+\.\d*([Ee][-+]\d+)?i`, LiteralNumber, nil},
+			{`\.\d+([Ee][-+]\d+)?i`, LiteralNumber, nil},
+			{`-?\d+[Ee][-+]\d+i`, LiteralNumber, nil},
+			{`-?\d+(\.\d+[eE][+\-]?\d+|\.\d*|[eE][+\-]?\d+)`, LiteralNumberFloat, nil},
+			{`-?\.\d+([eE][+\-]?\d+)?`, LiteralNumberFloat, nil},
+			{`-?0[0-7]+`, LiteralNumberOct, nil},
+			{`-?0[xX][0-9a-fA-F]+`, LiteralNumberHex, nil},
+			{`-?(0|[1-9][0-9]*)`, LiteralNumberInteger, nil},
+			{`'(\\['"\\abfnrtv]|\\x[0-9a-fA-F]{2}|\\[0-7]{1,3}|\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}|[^\\])'`, LiteralStringChar, nil},
+			{"`[^`]*`", LiteralString, nil},
+		},
+	}
+}
+
+var GoHTMLTemplate = internal.Register(DelegatingLexer(h.HTML, MustNewLazyLexer(
 	&Config{
 		Name:    "Go HTML Template",
 		Aliases: []string{"go-html-template"},
@ -106,7 +112,7 @@ var GoHTMLTemplate = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
 	goTemplateRules,
 )))

-var GoTextTemplate = internal.Register(MustNewLexer(
+var GoTextTemplate = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:    "Go Text Template",
 		Aliases: []string{"go-text-template"},
--- a/lexers/g/graphql.go
+++ b/lexers/g/graphql.go
@ -6,13 +6,17 @@ import (
 )

 // Go lexer.
-var Graphql = internal.Register(MustNewLexer(
+var Graphql = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "GraphQL",
 		Aliases:   []string{"graphql", "graphqls", "gql"},
 		Filenames: []string{"*.graphql", "*.graphqls"},
 	},
-	Rules{
+	graphqlRules,
+))
+
+func graphqlRules() Rules {
+	return Rules{
 		"root": {
 			{`(query|mutation|subscription|fragment|scalar|implements|interface|union|enum|input|type)`, KeywordDeclaration, Push("type")},
 			{`(on|extend|schema|directive|\.\.\.)`, KeywordDeclaration, nil},
@ -41,5 +45,5 @@ var Graphql = internal.Register(MustNewLexer(
 			{`[^\W\d]\w*`, NameClass, Pop(1)},
 			Include("root"),
 		},
-	},
-))
+	}
+}
--- a/lexers/g/groovy.go
+++ b/lexers/g/groovy.go
@ -6,7 +6,7 @@ import (
 )

 // Groovy lexer.
-var Groovy = internal.Register(MustNewLexer(
+var Groovy = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Groovy",
 		Aliases:   []string{"groovy"},
@ -14,7 +14,11 @@ var Groovy = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-groovy"},
 		DotAll:    true,
 	},
-	Rules{
+	groovyRules,
+))
+
+func groovyRules() Rules {
+	return Rules{
 		"root": {
 			{`#!(.*?)$`, CommentPreproc, Push("base")},
 			Default(Push("base")),
@ -54,5 +58,5 @@ var Groovy = internal.Register(MustNewLexer(
 		"import": {
 			{`[\w.]+\*?`, NameNamespace, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/h/handlebars.go
+++ b/lexers/h/handlebars.go
@ -6,14 +6,18 @@ import (
 )

 // Handlebars lexer.
-var Handlebars = internal.Register(MustNewLexer(
+var Handlebars = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Handlebars",
 		Aliases:   []string{"handlebars", "hbs"},
 		Filenames: []string{"*.handlebars", "*.hbs"},
 		MimeTypes: []string{},
 	},
-	Rules{
+	handlebarsRules,
+))
+
+func handlebarsRules() Rules {
+	return Rules{
 		"root": {
 			{`[^{]+`, Other, nil},
 			{`\{\{!.*\}\}`, Comment, nil},
@ -52,5 +56,5 @@ var Handlebars = internal.Register(MustNewLexer(
 			{`:?'(\\\\|\\'|[^'])*'`, LiteralStringSingle, nil},
 			{`[0-9](\.[0-9]*)?(eE[+-][0-9])?[flFLdD]?|0[xX][0-9a-fA-F]+[Ll]?`, LiteralNumber, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/h/haskell.go
+++ b/lexers/h/haskell.go
@ -6,14 +6,18 @@ import (
 )

 // Haskell lexer.
-var Haskell = internal.Register(MustNewLexer(
+var Haskell = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Haskell",
 		Aliases:   []string{"haskell", "hs"},
 		Filenames: []string{"*.hs"},
 		MimeTypes: []string{"text/x-haskell"},
 	},
-	Rules{
+	haskellRules,
+))
+
+func haskellRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`--(?![!#$%&*+./<=>?@^|_~:\\]).*?$`, CommentSingle, nil},
@ -95,5 +99,5 @@ var Haskell = internal.Register(MustNewLexer(
 			{`\d+`, LiteralStringEscape, Pop(1)},
 			{`\s+\\`, LiteralStringEscape, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/h/haxe.go
+++ b/lexers/h/haxe.go
@ -6,7 +6,7 @@ import (
 )

 // Haxe lexer.
-var Haxe = internal.Register(MustNewLexer(
+var Haxe = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Haxe",
 		Aliases:   []string{"hx", "haxe", "hxsl"},
@ -14,7 +14,11 @@ var Haxe = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/haxe", "text/x-haxe", "text/x-hx"},
 		DotAll:    true,
 	},
-	Rules{
+	haxeRules,
+))
+
+func haxeRules() Rules {
+	return Rules{
 		"root": {
 			Include("spaces"),
 			Include("meta"),
@ -609,8 +613,8 @@ var Haxe = internal.Register(MustNewLexer(
 			{`\}`, Punctuation, Pop(1)},
 			{`,`, Punctuation, Push("#pop", "object")},
 		},
-	},
-))
+	}
+}

 func haxePreProcMutator(state *LexerState) error {
 	stack, ok := state.Get("haxe-pre-proc").([][]string)
--- a/lexers/h/hcl.go
+++ b/lexers/h/hcl.go
@ -6,14 +6,18 @@ import (
 )

 // HCL lexer.
-var HCL = internal.Register(MustNewLexer(
+var HCL = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "HCL",
 		Aliases:   []string{"hcl"},
 		Filenames: []string{"*.hcl"},
 		MimeTypes: []string{"application/x-hcl"},
 	},
-	Rules{
+	hclRules,
+))
+
+func hclRules() Rules {
+	return Rules{
 		"root": {
 			Include("string"),
 			Include("punctuation"),
@ -65,5 +69,5 @@ var HCL = internal.Register(MustNewLexer(
 			{`\s+`, Text, nil},
 			{`\\\n`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/h/hexdump.go
+++ b/lexers/h/hexdump.go
@ -6,14 +6,18 @@ import (
 )

 // Hexdump lexer.
-var Hexdump = internal.Register(MustNewLexer(
+var Hexdump = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Hexdump",
 		Aliases:   []string{"hexdump"},
 		Filenames: []string{},
 		MimeTypes: []string{},
 	},
-	Rules{
+	hexdumpRules,
+))
+
+func hexdumpRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			Include("offset"),
@ -63,5 +67,5 @@ var Hexdump = internal.Register(MustNewLexer(
 			{`\s`, Text, nil},
 			{`^\*`, Punctuation, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/h/hlb.go
+++ b/lexers/h/hlb.go
@ -6,14 +6,18 @@ import (
 )

 // HLB lexer.
-var HLB = internal.Register(MustNewLexer(
+var HLB = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "HLB",
 		Aliases:   []string{"hlb"},
 		Filenames: []string{"*.hlb"},
 		MimeTypes: []string{},
 	},
-	Rules{
+	hlbRules,
+))
+
+func hlbRules() Rules {
+	return Rules{
 		"root": {
 			{`(#.*)`, ByGroups(CommentSingle), nil},
 			{`((\b(0(b|B|o|O|x|X)[a-fA-F0-9]+)\b)|(\b(0|[1-9][0-9]*)\b))`, ByGroups(LiteralNumber), nil},
@ -50,5 +54,5 @@ var HLB = internal.Register(MustNewLexer(
 			{`(\n|\r|\r\n)`, Text, nil},
 			{`.`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/h/html.go
+++ b/lexers/h/html.go
@ -8,7 +8,7 @@ import (
 )

 // HTML lexer.
-var HTML = internal.Register(MustNewLexer(
+var HTML = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "HTML",
 		Aliases:         []string{"html"},
@ -18,7 +18,11 @@ var HTML = internal.Register(MustNewLexer(
 		DotAll:          true,
 		CaseInsensitive: true,
 	},
-	Rules{
+	htmlRules,
+))
+
+func htmlRules() Rules {
+	return Rules{
 		"root": {
 			{`[^<&]+`, Text, nil},
 			{`&\S*?;`, NameEntity, nil},
@ -55,5 +59,5 @@ var HTML = internal.Register(MustNewLexer(
 			{`'.*?'`, LiteralString, Pop(1)},
 			{`[^\s>]+`, LiteralString, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/h/http.go
+++ b/lexers/h/http.go
@ -8,7 +8,7 @@ import (
 )

 // HTTP lexer.
-var HTTP = internal.Register(httpBodyContentTypeLexer(MustNewLexer(
+var HTTP = internal.Register(httpBodyContentTypeLexer(MustNewLazyLexer(
 	&Config{
 		Name:         "HTTP",
 		Aliases:      []string{"http"},
@ -17,7 +17,11 @@ var HTTP = internal.Register(httpBodyContentTypeLexer(MustNewLexer(
 		NotMultiline: true,
 		DotAll:       true,
 	},
-	Rules{
+	httpRules,
+)))
+
+func httpRules() Rules {
+	return Rules{
 		"root": {
 			{`(GET|POST|PUT|DELETE|HEAD|OPTIONS|TRACE|PATCH|CONNECT)( +)([^ ]+)( +)(HTTP)(/)([12]\.[01])(\r?\n|\Z)`, ByGroups(NameFunction, Text, NameNamespace, Text, KeywordReserved, Operator, LiteralNumber, Text), Push("headers")},
 			{`(HTTP)(/)([12]\.[01])( +)(\d{3})( +)([^\r\n]+)(\r?\n|\Z)`, ByGroups(KeywordReserved, Operator, LiteralNumber, Text, LiteralNumber, Text, NameException, Text), Push("headers")},
@ -30,8 +34,8 @@ var HTTP = internal.Register(httpBodyContentTypeLexer(MustNewLexer(
 		"content": {
 			{`.+`, EmitterFunc(httpContentBlock), nil},
 		},
-	},
-)))
+	}
+}

 func httpContentBlock(groups []string, lexer Lexer) Iterator {
 	tokens := []Token{
--- a/lexers/h/hy.go
+++ b/lexers/h/hy.go
@ -6,14 +6,18 @@ import (
 )

 // Hy lexer.
-var Hy = internal.Register(MustNewLexer(
+var Hy = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Hy",
 		Aliases:   []string{"hylang"},
 		Filenames: []string{"*.hy"},
 		MimeTypes: []string{"text/x-hy", "application/x-hy"},
 	},
-	Rules{
+	hyRules,
+))
+
+func hyRules() Rules {
+	return Rules{
 		"root": {
 			{`;.*$`, CommentSingle, nil},
 			{`[,\s]+`, Text, nil},
@ -47,5 +51,5 @@ var Hy = internal.Register(MustNewLexer(
 			{`(?<!\.)(self|None|Ellipsis|NotImplemented|False|True|cls)\b`, NameBuiltinPseudo, nil},
 			{Words(`(?<!\.)`, `\b`, `ArithmeticError`, `AssertionError`, `AttributeError`, `BaseException`, `DeprecationWarning`, `EOFError`, `EnvironmentError`, `Exception`, `FloatingPointError`, `FutureWarning`, `GeneratorExit`, `IOError`, `ImportError`, `ImportWarning`, `IndentationError`, `IndexError`, `KeyError`, `KeyboardInterrupt`, `LookupError`, `MemoryError`, `NameError`, `NotImplemented`, `NotImplementedError`, `OSError`, `OverflowError`, `OverflowWarning`, `PendingDeprecationWarning`, `ReferenceError`, `RuntimeError`, `RuntimeWarning`, `StandardError`, `StopIteration`, `SyntaxError`, `SyntaxWarning`, `SystemError`, `SystemExit`, `TabError`, `TypeError`, `UnboundLocalError`, `UnicodeDecodeError`, `UnicodeEncodeError`, `UnicodeError`, `UnicodeTranslateError`, `UnicodeWarning`, `UserWarning`, `ValueError`, `VMSError`, `Warning`, `WindowsError`, `ZeroDivisionError`), NameException, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/i/idris.go
+++ b/lexers/i/idris.go
@ -6,14 +6,18 @@ import (
 )

 // Idris lexer.
-var Idris = internal.Register(MustNewLexer(
+var Idris = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Idris",
 		Aliases:   []string{"idris", "idr"},
 		Filenames: []string{"*.idr"},
 		MimeTypes: []string{"text/x-idris"},
 	},
-	Rules{
+	idrisRules,
+))
+
+func idrisRules() Rules {
+	return Rules{
 		"root": {
 			{`^(\s*)(%lib|link|flag|include|hide|freeze|access|default|logging|dynamic|name|error_handlers|language)`, ByGroups(Text, KeywordReserved), nil},
 			{`(\s*)(--(?![!#$%&*+./<=>?@^|_~:\\]).*?)$`, ByGroups(Text, CommentSingle), nil},
@ -76,5 +80,5 @@ var Idris = internal.Register(MustNewLexer(
 			{`\d+`, LiteralStringEscape, Pop(1)},
 			{`\s+\\`, LiteralStringEscape, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/i/igor.go
+++ b/lexers/i/igor.go
@ -6,7 +6,7 @@ import (
 )

 // Igor lexer.
-var Igor = internal.Register(MustNewLexer(
+var Igor = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Igor",
 		Aliases:         []string{"igor", "igorpro"},
@ -14,7 +14,11 @@ var Igor = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/ipf"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	igorRules,
+))
+
+func igorRules() Rules {
+	return Rules{
 		"root": {
 			{`//.*$`, CommentSingle, nil},
 			{`"([^"\\]|\\.)*"`, LiteralString, nil},
@ -28,5 +32,5 @@ var Igor = internal.Register(MustNewLexer(
 			{`.`, Text, nil},
 			{`\n|\r`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/i/ini.go
+++ b/lexers/i/ini.go
@ -6,14 +6,18 @@ import (
 )

 // Ini lexer.
-var Ini = internal.Register(MustNewLexer(
+var Ini = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "INI",
 		Aliases:   []string{"ini", "cfg", "dosini"},
 		Filenames: []string{"*.ini", "*.cfg", "*.inf", ".gitconfig", ".editorconfig"},
 		MimeTypes: []string{"text/x-ini", "text/inf"},
 	},
-	Rules{
+	iniRules,
+))
+
+func iniRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`[;#].*`, CommentSingle, nil},
@ -21,5 +25,5 @@ var Ini = internal.Register(MustNewLexer(
 			{`(.*?)([ \t]*)(=)([ \t]*)(.*(?:\n[ \t].+)*)`, ByGroups(NameAttribute, Text, Operator, Text, LiteralString), nil},
 			{`(.+?)$`, NameAttribute, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/i/io.go
+++ b/lexers/i/io.go
@ -6,14 +6,18 @@ import (
 )

 // Io lexer.
-var Io = internal.Register(MustNewLexer(
+var Io = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Io",
 		Aliases:   []string{"io"},
 		Filenames: []string{"*.io"},
 		MimeTypes: []string{"text/x-iosrc"},
 	},
-	Rules{
+	ioRules,
+))
+
+func ioRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			{`\s+`, Text, nil},
@ -36,5 +40,5 @@ var Io = internal.Register(MustNewLexer(
 			{`\+/`, CommentMultiline, Pop(1)},
 			{`[+/]`, CommentMultiline, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/internal/api.go
+++ b/lexers/internal/api.go
@ -146,16 +146,19 @@ func Register(lexer chroma.Lexer) chroma.Lexer {
 	return lexer
 }

-// Used for the fallback lexer as well as the explicit plaintext lexer
-var PlaintextRules = chroma.Rules{
-	"root": []chroma.Rule{
-		{`.+`, chroma.Text, nil},
-		{`\n`, chroma.Text, nil},
-	},
+// PlaintextRules is used for the fallback lexer as well as the explicit
+// plaintext lexer.
+func PlaintextRules() chroma.Rules {
+	return chroma.Rules{
+		"root": []chroma.Rule{
+			{`.+`, chroma.Text, nil},
+			{`\n`, chroma.Text, nil},
+		},
+	}
 }

 // Fallback lexer if no other is found.
-var Fallback chroma.Lexer = chroma.MustNewLexer(&chroma.Config{
+var Fallback chroma.Lexer = chroma.MustNewLazyLexer(&chroma.Config{
 	Name:      "fallback",
 	Filenames: []string{"*"},
 }, PlaintextRules)
--- a/lexers/j/j.go
+++ b/lexers/j/j.go
@ -6,14 +6,18 @@ import (
 )

 // J lexer.
-var J = internal.Register(MustNewLexer(
+var J = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "J",
 		Aliases:   []string{"j"},
 		Filenames: []string{"*.ijs"},
 		MimeTypes: []string{"text/x-j"},
 	},
-	Rules{
+	jRules,
+))
+
+func jRules() Rules {
+	return Rules{
 		"root": {
 			{`#!.*$`, CommentPreproc, nil},
 			{`NB\..*`, CommentSingle, nil},
@ -69,5 +73,5 @@ var J = internal.Register(MustNewLexer(
 			{`''`, LiteralString, nil},
 			{`'`, LiteralString, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/j/java.go
+++ b/lexers/j/java.go
@ -6,7 +6,7 @@ import (
 )

 // Java lexer.
-var Java = internal.Register(MustNewLexer(
+var Java = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Java",
 		Aliases:   []string{"java"},
@ -15,7 +15,11 @@ var Java = internal.Register(MustNewLexer(
 		DotAll:    true,
 		EnsureNL:  true,
 	},
-	Rules{
+	javaRules,
+))
+
+func javaRules() Rules {
+	return Rules{
 		"root": {
 			{`[^\S\n]+`, Text, nil},
 			{`//.*?\n`, CommentSingle, nil},
@ -48,5 +52,5 @@ var Java = internal.Register(MustNewLexer(
 		"import": {
 			{`[\w.]+\*?`, NameNamespace, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/j/json.go
+++ b/lexers/j/json.go
@ -6,7 +6,7 @@ import (
 )

 // JSON lexer.
-var JSON = internal.Register(MustNewLexer(
+var JSON = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:         "JSON",
 		Aliases:      []string{"json"},
@ -15,7 +15,11 @@ var JSON = internal.Register(MustNewLexer(
 		NotMultiline: true,
 		DotAll:       true,
 	},
-	Rules{
+	jsonRules,
+))
+
+func jsonRules() Rules {
+	return Rules{
 		"whitespace": {
 			{`\s+`, Text, nil},
 		},
@ -51,5 +55,5 @@ var JSON = internal.Register(MustNewLexer(
 		"root": {
 			Include("value"),
 		},
-	},
-))
+	}
+}
--- a/lexers/j/jsx.go
+++ b/lexers/j/jsx.go
@ -8,7 +8,7 @@ import (
 // JSX lexer.
 //
 // This was generated from https://github.com/fcurella/jsx-lexer
-var JSX = internal.Register(MustNewLexer(
+var JSX = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "react",
 		Aliases:   []string{"jsx", "react"},
@ -16,7 +16,11 @@ var JSX = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/jsx", "text/typescript-jsx"},
 		DotAll:    true,
 	},
-	Rules{
+	jsxRules,
+))
+
+func jsxRules() Rules {
+	return Rules{
 		"commentsandwhitespace": {
 			{`\s+`, Text, nil},
 			{`<!--`, Comment, nil},
@ -91,5 +95,5 @@ var JSX = internal.Register(MustNewLexer(
 			{`}`, Punctuation, Pop(1)},
 			Include("root"),
 		},
-	},
-))
+	}
+}
--- a/lexers/j/julia.go
+++ b/lexers/j/julia.go
@ -6,14 +6,18 @@ import (
 )

 // Julia lexer.
-var Julia = internal.Register(MustNewLexer(
+var Julia = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Julia",
 		Aliases:   []string{"julia", "jl"},
 		Filenames: []string{"*.jl"},
 		MimeTypes: []string{"text/x-julia", "application/x-julia"},
 	},
-	Rules{
+	juliaRules,
+))
+
+func juliaRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			{`[^\S\n]+`, Text, nil},
@ -91,5 +95,5 @@ var Julia = internal.Register(MustNewLexer(
 			{`\)`, Punctuation, Pop(1)},
 			Include("root"),
 		},
-	},
-))
+	}
+}
--- a/lexers/j/jungle.go
+++ b/lexers/j/jungle.go
@ -5,14 +5,18 @@ import (
 	"github.com/alecthomas/chroma/lexers/internal"
 )

-var Jungle = internal.Register(MustNewLexer(
+var Jungle = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Jungle",
 		Aliases:   []string{"jungle"},
 		Filenames: []string{"*.jungle"},
 		MimeTypes: []string{"text/x-jungle"},
 	},
-	Rules{
+	jungleRules,
+))
+
+func jungleRules() Rules {
+	return Rules{
 		"root": {
 			{`[^\S\n]+`, Text, nil},
 			{`\n`, Text, nil},
@ -46,5 +50,5 @@ var Jungle = internal.Register(MustNewLexer(
 			{`[a-zA-Z_]\w*`, Name, nil},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}
--- a/lexers/k/kotlin.go
+++ b/lexers/k/kotlin.go
--- a/lexers/l/lighttpd.go
+++ b/lexers/l/lighttpd.go
@ -6,14 +6,18 @@ import (
 )

 // Lighttpd Configuration File lexer.
-var Lighttpd = internal.Register(MustNewLexer(
+var Lighttpd = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Lighttpd configuration file",
 		Aliases:   []string{"lighty", "lighttpd"},
 		Filenames: []string{},
 		MimeTypes: []string{"text/x-lighttpd-conf"},
 	},
-	Rules{
+	lighttpdRules,
+))
+
+func lighttpdRules() Rules {
+	return Rules{
 		"root": {
 			{`#.*\n`, CommentSingle, nil},
 			{`/\S*`, Name, nil},
@ -26,5 +30,5 @@ var Lighttpd = internal.Register(MustNewLexer(
 			{`"([^"\\]*(?:\\.[^"\\]*)*)"`, LiteralStringDouble, nil},
 			{`\s+`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/l/llvm.go
+++ b/lexers/l/llvm.go
@ -6,14 +6,18 @@ import (
 )

 // Llvm lexer.
-var Llvm = internal.Register(MustNewLexer(
+var Llvm = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "LLVM",
 		Aliases:   []string{"llvm"},
 		Filenames: []string{"*.ll"},
 		MimeTypes: []string{"text/x-llvm"},
 	},
-	Rules{
+	llvmRules,
+))
+
+func llvmRules() Rules {
+	return Rules{
 		"root": {
 			Include("whitespace"),
 			{`([-a-zA-Z$._][\w\-$.]*|"[^"]*?")\s*:`, NameLabel, nil},
@ -39,5 +43,5 @@ var Llvm = internal.Register(MustNewLexer(
 			{Words(``, ``, `void`, `half`, `float`, `double`, `x86_fp80`, `fp128`, `ppc_fp128`, `label`, `metadata`, `token`), KeywordType, nil},
 			{`i[1-9]\d*`, Keyword, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/l/lua.go
+++ b/lexers/l/lua.go
@ -6,14 +6,18 @@ import (
 )

 // Lua lexer.
-var Lua = internal.Register(MustNewLexer(
+var Lua = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Lua",
 		Aliases:   []string{"lua"},
 		Filenames: []string{"*.lua", "*.wlua"},
 		MimeTypes: []string{"text/x-lua", "application/x-lua"},
 	},
-	Rules{
+	luaRules,
+))
+
+func luaRules() Rules {
+	return Rules{
 		"root": {
 			{`#!.*`, CommentPreproc, nil},
 			Default(Push("base")),
@ -71,5 +75,5 @@ var Lua = internal.Register(MustNewLexer(
 			{`"`, LiteralStringDouble, Pop(1)},
 			{`[^\\"]+`, LiteralStringDouble, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/make.go
+++ b/lexers/m/make.go
@ -7,7 +7,7 @@ import (
 )

 // Makefile lexer.
-var Makefile = internal.Register(MustNewLexer(
+var Makefile = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Base Makefile",
 		Aliases:   []string{"make", "makefile", "mf", "bsdmake"},
@ -15,7 +15,11 @@ var Makefile = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-makefile"},
 		EnsureNL:  true,
 	},
-	Rules{
+	makefileRules,
+))
+
+func makefileRules() Rules {
+	return Rules{
 		"root": {
 			{`^(?:[\t ]+.*\n|\n)+`, Using(Bash), nil},
 			{`\$[<@$+%?|*]`, Keyword, nil},
@ -50,5 +54,5 @@ var Makefile = internal.Register(MustNewLexer(
 			{`\n`, Text, Pop(1)},
 			{`.`, Text, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/mako.go
+++ b/lexers/m/mako.go
@ -7,14 +7,18 @@ import (
 )

 // Mako lexer.
-var Mako = internal.Register(MustNewLexer(
+var Mako = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Mako",
 		Aliases:   []string{"mako"},
 		Filenames: []string{"*.mao"},
 		MimeTypes: []string{"application/x-mako"},
 	},
-	Rules{
+	makoRules,
+))
+
+func makoRules() Rules {
+	return Rules{
 		"root": {
 			{`(\s*)(%)(\s*end(?:\w+))(\n|\Z)`, ByGroups(Text, CommentPreproc, Keyword, Other), nil},
 			{`(\s*)(%)([^\n]*)(\n|\Z)`, ByGroups(Text, CommentPreproc, Using(Python), Other), nil},
@ -56,5 +60,5 @@ var Mako = internal.Register(MustNewLexer(
 			{`'.*?'`, LiteralString, Pop(1)},
 			{`[^\s>]+`, LiteralString, Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/markdown.go
+++ b/lexers/m/markdown.go
@ -7,14 +7,18 @@ import (
 )

 // Markdown lexer.
-var Markdown = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
+var Markdown = internal.Register(DelegatingLexer(h.HTML, MustNewLazyLexer(
 	&Config{
 		Name:      "markdown",
 		Aliases:   []string{"md", "mkd"},
 		Filenames: []string{"*.md", "*.mkd", "*.markdown"},
 		MimeTypes: []string{"text/x-markdown"},
 	},
-	Rules{
+	markdownRules,
+)))
+
+func markdownRules() Rules {
+	return Rules{
 		"root": {
 			{`^(#[^#].+\n)`, ByGroups(GenericHeading), nil},
 			{`^(#{2,6}.+\n)`, ByGroups(GenericSubheading), nil},
@ -23,7 +27,8 @@ var Markdown = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
 			{`^(\s*)([0-9]+\.)( .+\n)`, ByGroups(Text, Keyword, UsingSelf("inline")), nil},
 			{`^(\s*>\s)(.+\n)`, ByGroups(Keyword, GenericEmph), nil},
 			{"^(```\\n)([\\w\\W]*?)(^```$)", ByGroups(String, Text, String), nil},
-			{"^(```)(\\w+)(\\n)([\\w\\W]*?)(^```$)",
+			{
+				"^(```)(\\w+)(\\n)([\\w\\W]*?)(^```$)",
 				UsingByGroup(
 					internal.Get,
 					2, 4,
@ -44,5 +49,5 @@ var Markdown = internal.Register(DelegatingLexer(h.HTML, MustNewLexer(
 			{`[^\\\s]+`, Other, nil},
 			{`.|\n`, Other, nil},
 		},
-	},
-)))
+	}
+}
--- a/lexers/m/mason.go
+++ b/lexers/m/mason.go
@ -8,7 +8,7 @@ import (
 )

 // Mason lexer.
-var Mason = internal.Register(MustNewLexer(
+var Mason = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Mason",
 		Aliases:   []string{"mason"},
@ -16,7 +16,11 @@ var Mason = internal.Register(MustNewLexer(
 		MimeTypes: []string{"application/x-mason"},
 		Priority:  0.1,
 	},
-	Rules{
+	masonRules,
+))
+
+func masonRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`(<%doc>)(.*?)(</%doc>)(?s)`, ByGroups(NameTag, CommentMultiline, NameTag), nil},
@ -39,5 +43,5 @@ var Mason = internal.Register(MustNewLexer(
                  \Z                 # end of string
                 )`, ByGroups(Using(HTML), Operator), nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/mathematica.go
+++ b/lexers/m/mathematica.go
@ -6,14 +6,18 @@ import (
 )

 // Mathematica lexer.
-var Mathematica = internal.Register(MustNewLexer(
+var Mathematica = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Mathematica",
 		Aliases:   []string{"mathematica", "mma", "nb"},
 		Filenames: []string{"*.nb", "*.cdf", "*.nbp", "*.ma"},
 		MimeTypes: []string{"application/mathematica", "application/vnd.wolfram.mathematica", "application/vnd.wolfram.mathematica.package", "application/vnd.wolfram.cdf"},
 	},
-	Rules{
+	mathematicaRules,
+))
+
+func mathematicaRules() Rules {
+	return Rules{
 		"root": {
 			{`(?s)\(\*.*?\*\)`, Comment, nil},
 			{"([a-zA-Z]+[A-Za-z0-9]*`)", NameNamespace, nil},
@ -28,5 +32,5 @@ var Mathematica = internal.Register(MustNewLexer(
 			{`".*?"`, LiteralString, nil},
 			{`\s+`, TextWhitespace, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/matlab.go
+++ b/lexers/m/matlab.go
@ -6,14 +6,18 @@ import (
 )

 // Matlab lexer.
-var Matlab = internal.Register(MustNewLexer(
+var Matlab = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Matlab",
 		Aliases:   []string{"matlab"},
 		Filenames: []string{"*.m"},
 		MimeTypes: []string{"text/matlab"},
 	},
-	Rules{
+	matlabRules,
+))
+
+func matlabRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			{`^!.*`, LiteralStringOther, nil},
@ -47,5 +51,5 @@ var Matlab = internal.Register(MustNewLexer(
 			{`(\s*)(?:(.+)(\s*)(=)(\s*))?(.+)(\()(.*)(\))(\s*)`, ByGroups(TextWhitespace, Text, TextWhitespace, Punctuation, TextWhitespace, NameFunction, Punctuation, Text, Punctuation, TextWhitespace), Pop(1)},
 			{`(\s*)([a-zA-Z_]\w*)`, ByGroups(Text, NameFunction), Pop(1)},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/minizinc.go
+++ b/lexers/m/minizinc.go
@ -6,14 +6,18 @@ import (
 )

 // MiniZinc lexer.
-var MZN = internal.Register(MustNewLexer(
+var MZN = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "MiniZinc",
 		Aliases:   []string{"minizinc", "MZN", "mzn"},
 		Filenames: []string{"*.mzn", "*.dzn", "*.fzn"},
 		MimeTypes: []string{"text/minizinc"},
 	},
-	Rules{
+	mznRules,
+))
+
+func mznRules() Rules {
+	return Rules{
 		"root": {
 			{`\n`, Text, nil},
 			{`\s+`, Text, nil},
@ -37,5 +41,5 @@ var MZN = internal.Register(MustNewLexer(
 			{`\b([^\W\d]\w*)\b(\()`, ByGroups(NameFunction, Punctuation), nil},
 			{`[^\W\d]\w*`, NameOther, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/mlir.go
+++ b/lexers/m/mlir.go
@ -6,14 +6,18 @@ import (
 )

 // MLIR lexer.
-var Mlir = internal.Register(MustNewLexer(
+var Mlir = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "MLIR",
 		Aliases:   []string{"mlir"},
 		Filenames: []string{"*.mlir"},
 		MimeTypes: []string{"text/x-mlir"},
 	},
-	Rules{
+	mlirRules,
+))
+
+func mlirRules() Rules {
+	return Rules{
 		"root": {
 			Include("whitespace"),
 			{`c?"[^"]*?"`, LiteralString, nil},
@ -39,5 +43,5 @@ var Mlir = internal.Register(MustNewLexer(
 			{`bf16|f16|f32|f64|index`, Keyword, nil},
 			{`i[1-9]\d*`, Keyword, nil},
 		},
-	},
-))
+	}
+}
--- a/lexers/m/modula2.go
+++ b/lexers/m/modula2.go
@ -6,7 +6,7 @@ import (
 )

 // Modula-2 lexer.
-var Modula2 = internal.Register(MustNewLexer(
+var Modula2 = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Modula-2",
 		Aliases:   []string{"modula2", "m2"},
@ -14,7 +14,11 @@ var Modula2 = internal.Register(MustNewLexer(
 		MimeTypes: []string{"text/x-modula2"},
 		DotAll:    true,
 	},
-	Rules{
+	modula2Rules,
+))
+
+func modula2Rules() Rules {
+	return Rules{
 		"whitespace": {
 			{`\n+`, Text, nil},
 			{`\s+`, Text, nil},
@ -111,5 +115,5 @@ var Modula2 = internal.Register(MustNewLexer(
 			Include("unigraph_punctuation"),
 			Include("unigraph_operators"),
 		},
-	},
-))
+	}
+}
--- a/lexers/m/monkeyc.go
+++ b/lexers/m/monkeyc.go
@ -5,14 +5,18 @@ import (
 	"github.com/alecthomas/chroma/lexers/internal"
 )

-var MonkeyC = internal.Register(MustNewLexer(
+var MonkeyC = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "MonkeyC",
 		Aliases:   []string{"monkeyc"},
 		Filenames: []string{"*.mc"},
 		MimeTypes: []string{"text/x-monkeyc"},
 	},
-	Rules{
+	monkeyCRules,
+))
+
+func monkeyCRules() Rules {
+	return Rules{
 		"root": {
 			{`[^\S\n]+`, Text, nil},
 			{`\n`, Text, nil},
@ -58,5 +62,5 @@ var MonkeyC = internal.Register(MustNewLexer(
 			{`[a-zA-Z_][\w_\.]*`, NameNamespace, nil},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}
--- a/Show More
+++ b/Show More